diff --git a/remix-core/index.js b/remix-core/index.js
index 723d3d42d4..546bcc6255 100644
--- a/remix-core/index.js
+++ b/remix-core/index.js
@@ -5,9 +5,6 @@ var StorageResolver = require('./src/storage/storageResolver')
 var TraceManager = require('./src/trace/traceManager')
 
 module.exports = {
-  global: {
-    web3: null
-  },
   code: {
     CodeManager: CodeManager,
     BreakpointManager: BreakpointManager
diff --git a/remix-core/src/code/codeManager.js b/remix-core/src/code/codeManager.js
index fb5256b442..ac6d5536a2 100644
--- a/remix-core/src/code/codeManager.js
+++ b/remix-core/src/code/codeManager.js
@@ -3,7 +3,7 @@ var remixLib = require('remix-lib')
 var EventManager = remixLib.EventManager
 var traceHelper = remixLib.helpers.trace
 var SourceMappingDecoder = remixLib.SourceMappingDecoder
-var codeResolver = require('./codeResolver')
+var CodeResolver = require('./codeResolver')
 
 /*
   resolve contract code referenced by vmtrace in order to be used by asm listview.
@@ -16,7 +16,7 @@ function CodeManager (_traceManager) {
   this.event = new EventManager()
   this.isLoading = false
   this.traceManager = _traceManager
-  this.codeResolver = codeResolver
+  this.codeResolver = new CodeResolver({web3: this.traceManager.web3})
 }
 
 /**
@@ -57,12 +57,13 @@ CodeManager.prototype.resolveStep = function (stepIndex, tx) {
  * @param {Function} cb - callback function, return the bytecode
  */
 CodeManager.prototype.getCode = function (address, cb) {
+  const self = this
   if (traceHelper.isContractCreation(address)) {
-    var codes = codeResolver.getExecutingCodeFromCache(address)
+    var codes = this.codeResolver.getExecutingCodeFromCache(address)
     if (!codes) {
       this.traceManager.getContractCreationCode(address, function (error, hexCode) {
         if (!error) {
-          codes = codeResolver.cacheExecutingCode(address, hexCode)
+          codes = self.codeResolver.cacheExecutingCode(address, hexCode)
           cb(null, codes)
         }
       })
@@ -70,7 +71,7 @@ CodeManager.prototype.getCode = function (address, cb) {
       cb(null, codes)
     }
   } else {
-    codeResolver.resolveCode(address, function (address, code) {
+    this.codeResolver.resolveCode(address, function (address, code) {
       cb(null, code)
     })
   }
@@ -111,12 +112,13 @@ CodeManager.prototype.getFunctionFromStep = function (stepIndex, sourceMap, ast)
  * @param {Function} callback - instruction index
  */
 CodeManager.prototype.getInstructionIndex = function (address, step, callback) {
+  const self = this
   this.traceManager.getCurrentPC(step, function (error, pc) {
     if (error) {
       console.log(error)
       callback('Cannot retrieve current PC for ' + step, null)
     } else {
-      var itemIndex = codeResolver.getInstructionIndex(address, pc)
+      var itemIndex = self.codeResolver.getInstructionIndex(address, pc)
       callback(null, itemIndex)
     }
   })
@@ -132,7 +134,7 @@ CodeManager.prototype.getInstructionIndex = function (address, step, callback) {
  * @return {Object} return the ast node of the function
  */
 CodeManager.prototype.getFunctionFromPC = function (address, pc, sourceMap, ast) {
-  var instIndex = codeResolver.getInstructionIndex(address, pc)
+  var instIndex = this.codeResolver.getInstructionIndex(address, pc)
   return SourceMappingDecoder.findNodeAtInstructionIndex('FunctionDefinition', instIndex, sourceMap, ast)
 }
 
diff --git a/remix-core/src/code/codeResolver.js b/remix-core/src/code/codeResolver.js
index 5a72b7fad6..87902cc3c2 100644
--- a/remix-core/src/code/codeResolver.js
+++ b/remix-core/src/code/codeResolver.js
@@ -1,72 +1,74 @@
 'use strict'
 var codeUtils = require('./codeUtils')
-var remixLib = require('remix-lib')
-var global = remixLib.global
 
-module.exports = {
-  bytecodeByAddress: {}, // bytes code by contract addesses
-  instructionsByAddress: {}, // assembly items instructions list by contract addesses
-  instructionsIndexByBytesOffset: {}, // mapping between bytes offset and instructions index.
+function CodeResolver (options) {
+  this.web3 = options.web3
 
-  clear: function () {
-    this.bytecodeByAddress = {}
-    this.instructionsByAddress = {}
-    this.instructionsIndexByBytesOffset = {}
-  },
-
-  resolveCode: function (address, callBack) {
-    var cache = this.getExecutingCodeFromCache(address)
-    if (cache) {
-      callBack(address, cache)
-      return
-    }
-
-    var self = this
-    this.loadCode(address, function (code) {
-      callBack(address, self.cacheExecutingCode(address, code))
-    })
-  },
+  this.bytecodeByAddress = {} // bytes code by contract addesses
+  this.instructionsByAddress = {} // assembly items instructions list by contract addesses
+  this.instructionsIndexByBytesOffset = {} // mapping between bytes offset and instructions index.
+}
 
-  loadCode: function (address, callback) {
-    console.log('loading new code from web3 ' + address)
-    global.web3.eth.getCode(address, function (error, result) {
-      if (error) {
-        console.log(error)
-      } else {
-        callback(result)
-      }
-    })
-  },
+CodeResolver.prototype.clear = function () {
+  this.bytecodeByAddress = {}
+  this.instructionsByAddress = {}
+  this.instructionsIndexByBytesOffset = {}
+}
 
-  cacheExecutingCode: function (address, hexCode) {
-    var codes = this.formatCode(hexCode)
-    this.bytecodeByAddress[address] = hexCode
-    this.instructionsByAddress[address] = codes.code
-    this.instructionsIndexByBytesOffset[address] = codes.instructionsIndexByBytesOffset
-    return this.getExecutingCodeFromCache(address)
-  },
+CodeResolver.prototype.resolveCode = function (address, callBack) {
+  var cache = this.getExecutingCodeFromCache(address)
+  if (cache) {
+    callBack(address, cache)
+    return
+  }
 
-  formatCode: function (hexCode) {
-    var code = codeUtils.nameOpCodes(new Buffer(hexCode.substring(2), 'hex'))
-    return {
-      code: code[0],
-      instructionsIndexByBytesOffset: code[1]
-    }
-  },
+  var self = this
+  this.loadCode(address, function (code) {
+    callBack(address, self.cacheExecutingCode(address, code))
+  })
+}
 
-  getExecutingCodeFromCache: function (address) {
-    if (this.instructionsByAddress[address]) {
-      return {
-        instructions: this.instructionsByAddress[address],
-        instructionsIndexByBytesOffset: this.instructionsIndexByBytesOffset[address],
-        bytecode: this.bytecodeByAddress[address]
-      }
+CodeResolver.prototype.loadCode = function (address, callback) {
+  console.log('loading new code from web3 ' + address)
+  this.web3.eth.getCode(address, function (error, result) {
+    if (error) {
+      console.log(error)
     } else {
-      return null
+      callback(result)
     }
-  },
+  })
+}
 
-  getInstructionIndex: function (address, pc) {
-    return this.getExecutingCodeFromCache(address).instructionsIndexByBytesOffset[pc]
+CodeResolver.prototype.cacheExecutingCode = function (address, hexCode) {
+  var codes = this.formatCode(hexCode)
+  this.bytecodeByAddress[address] = hexCode
+  this.instructionsByAddress[address] = codes.code
+  this.instructionsIndexByBytesOffset[address] = codes.instructionsIndexByBytesOffset
+  return this.getExecutingCodeFromCache(address)
+}
+
+CodeResolver.prototype.formatCode = function (hexCode) {
+  var code = codeUtils.nameOpCodes(new Buffer(hexCode.substring(2), 'hex'))
+  return {
+    code: code[0],
+    instructionsIndexByBytesOffset: code[1]
+  }
+}
+
+CodeResolver.prototype.getExecutingCodeFromCache = function (address) {
+  if (this.instructionsByAddress[address]) {
+    return {
+      instructions: this.instructionsByAddress[address],
+      instructionsIndexByBytesOffset: this.instructionsIndexByBytesOffset[address],
+      bytecode: this.bytecodeByAddress[address]
+    }
+  } else {
+    return null
   }
 }
+
+CodeResolver.prototype.getInstructionIndex = function (address, pc) {
+  return this.getExecutingCodeFromCache(address).instructionsIndexByBytesOffset[pc]
+}
+
+module.exports = CodeResolver
diff --git a/remix-core/src/storage/mappingPreimages.js b/remix-core/src/storage/mappingPreimages.js
index 522b83ec8c..5f6d4a47dd 100644
--- a/remix-core/src/storage/mappingPreimages.js
+++ b/remix-core/src/storage/mappingPreimages.js
@@ -1,5 +1,3 @@
-var remixLib = require('remix-lib')
-var global = remixLib.global
 
 module.exports = {
   decodeMappingsKeys: decodeMappingsKeys
@@ -13,12 +11,12 @@ module.exports = {
   * @param {Function} callback  - calback
   * @return {Map} - solidity mapping location (e.g { "<mapping_slot>" : { "<mapping-key1>": preimageOf1 }, { "<mapping-key2>": preimageOf2 }, ... })
   */
-async function decodeMappingsKeys (storage, callback) {
+async function decodeMappingsKeys (web3, storage, callback) {
   var ret = {}
   for (var hashedLoc in storage) {
     var preimage
     try {
-      preimage = await getPreimage(storage[hashedLoc].key)
+      preimage = await getPreimage(web3, storage[hashedLoc].key)
     } catch (e) {
     }
     if (preimage) {
@@ -42,9 +40,9 @@ async function decodeMappingsKeys (storage, callback) {
   * @param {String} key  - key to retrieve the preimage of
   * @return {String} - preimage of the given key
   */
-function getPreimage (key) {
+function getPreimage (web3, key) {
   return new Promise((resolve, reject) => {
-    global.web3Debug.debug.preimage(key.indexOf('0x') === 0 ? key : '0x' + key, function (error, preimage) {
+    web3.debug.preimage(key.indexOf('0x') === 0 ? key : '0x' + key, function (error, preimage) {
       if (error) {
         resolve(null)
       } else {
diff --git a/remix-core/src/storage/storageResolver.js b/remix-core/src/storage/storageResolver.js
index 368a6f1e84..245a73b6a2 100644
--- a/remix-core/src/storage/storageResolver.js
+++ b/remix-core/src/storage/storageResolver.js
@@ -1,7 +1,6 @@
 'use strict'
 var remixLib = require('remix-lib')
 var traceHelper = remixLib.helpers.trace
-var global = remixLib.global
 var mappingPreimages = require('./mappingPreimages')
 
 /**
@@ -9,34 +8,37 @@ var mappingPreimages = require('./mappingPreimages')
   * (TODO: one instance need to be shared over all the components)
   */
 class StorageResolver {
-  constructor () {
+  constructor (options) {
     this.storageByAddress = {}
     this.preimagesMappingByAddress = {}
     this.maxSize = 100
+    this.web3 = options.web3
+    this.zeroSlot = '0x0000000000000000000000000000000000000000000000000000000000000000'
   }
 
   /**
-    * returns the storage for the given context (address and vm trace index)
-    * returns the range 0x0 => this.maxSize
-    *
-    * @param {Object} - tx - transaction
-    * @param {Int} - stepIndex - Index of the stop in the vm trace
-    * @param {String} - address - lookup address
-    * @param {Function} - callback - contains a map: [hashedKey] = {key, hashedKey, value}
-    */
+   * returns the storage for the given context (address and vm trace index)
+   * returns the range 0x0 => this.maxSize
+   *
+   * @param {Object} - tx - transaction
+   * @param {Int} - stepIndex - Index of the stop in the vm trace
+   * @param {String} - address - lookup address
+   * @param {Function} - callback - contains a map: [hashedKey] = {key, hashedKey, value}
+   */
   storageRange (tx, stepIndex, address, callback) {
-    storageRangeInternal(this, zeroSlot, tx, stepIndex, address, callback)
+    this.storageRangeInternal(this, this.zeroSlot, tx, stepIndex, address, callback)
   }
 
   /**
-    * compute the mappgings type locations for the current address (cached for a debugging session)
-    * note: that only retrieve the first 100 items.
-    *
-    * @param {String} address  - contract address
-    * @param {Object} address  - storage
-    * @return {Function} - callback
-    */
+   * compute the mappgings type locations for the current address (cached for a debugging session)
+   * note: that only retrieve the first 100 items.
+   *
+   * @param {String} address  - contract address
+   * @param {Object} address  - storage
+   * @return {Function} - callback
+   */
   initialPreimagesMappings (tx, stepIndex, address, callback) {
+    const self = this
     if (this.preimagesMappingByAddress[address]) {
       return callback(null, this.preimagesMappingByAddress[address])
     }
@@ -44,7 +46,7 @@ class StorageResolver {
       if (error) {
         return callback(error)
       }
-      mappingPreimages.decodeMappingsKeys(storage, (error, mappings) => {
+      mappingPreimages.decodeMappingsKeys(self.web3, storage, (error, mappings) => {
         if (error) {
           callback(error)
         } else {
@@ -56,16 +58,16 @@ class StorageResolver {
   }
 
   /**
-    * return a slot value for the given context (address and vm trace index)
-    *
-    * @param {String} - slot - slot key
-    * @param {Object} - tx - transaction
-    * @param {Int} - stepIndex - Index of the stop in the vm trace
-    * @param {String} - address - lookup address
-    * @param {Function} - callback - {key, hashedKey, value} -
-    */
+   * return a slot value for the given context (address and vm trace index)
+   *
+   * @param {String} - slot - slot key
+   * @param {Object} - tx - transaction
+   * @param {Int} - stepIndex - Index of the stop in the vm trace
+   * @param {String} - address - lookup address
+   * @param {Function} - callback - {key, hashedKey, value} -
+   */
   storageSlot (slot, tx, stepIndex, address, callback) {
-    storageRangeInternal(this, slot, tx, stepIndex, address, function (error, storage) {
+    this.storageRangeInternal(this, slot, tx, stepIndex, address, function (error, storage) {
       if (error) {
         callback(error)
       } else {
@@ -75,91 +77,89 @@ class StorageResolver {
   }
 
   /**
-    * return True if the storage at @arg address is complete
-    *
-    * @param {String} address  - contract address
-    * @return {Bool} - return True if the storage at @arg address is complete
-    */
+   * return True if the storage at @arg address is complete
+   *
+   * @param {String} address  - contract address
+   * @return {Bool} - return True if the storage at @arg address is complete
+   */
   isComplete (address) {
     return this.storageByAddress[address] && this.storageByAddress[address].complete
   }
-}
 
-/**
-  * retrieve the storage and ensure at least @arg slot is cached.
-  * - If @arg slot is already cached, the storage will be returned from the cache
-  *   even if the next 1000 items are not in the cache.
-  * - If @arg slot is not cached, the corresponding value will be resolved and the next 1000 slots.
-  */
-function storageRangeInternal (self, slotKey, tx, stepIndex, address, callback) {
-  var cached = fromCache(self, address)
-  if (cached && cached.storage[slotKey]) { // we have the current slot in the cache and maybe the next 1000...
-    return callback(null, cached.storage)
-  }
-  storageRangeWeb3Call(tx, address, slotKey, self.maxSize, (error, storage, nextKey) => {
-    if (error) {
-      return callback(error)
+  /**
+   * retrieve the storage and ensure at least @arg slot is cached.
+   * - If @arg slot is already cached, the storage will be returned from the cache
+   *   even if the next 1000 items are not in the cache.
+   * - If @arg slot is not cached, the corresponding value will be resolved and the next 1000 slots.
+   */
+  storageRangeInternal (self, slotKey, tx, stepIndex, address, callback) {
+    var cached = this.fromCache(self, address)
+    if (cached && cached.storage[slotKey]) { // we have the current slot in the cache and maybe the next 1000...
+      return callback(null, cached.storage)
     }
-    if (!storage[slotKey] && slotKey !== zeroSlot) { // we don't cache the zero slot (could lead to inconsistency)
-      storage[slotKey] = {
-        key: slotKey,
-        value: zeroSlot
+    this.storageRangeWeb3Call(tx, address, slotKey, self.maxSize, (error, storage, nextKey) => {
+      if (error) {
+        return callback(error)
       }
-    }
-    toCache(self, address, storage)
-    if (slotKey === zeroSlot && !nextKey) { // only working if keys are sorted !!
-      self.storageByAddress[address].complete = true
-    }
-    callback(null, storage)
-  })
-}
-
-var zeroSlot = '0x0000000000000000000000000000000000000000000000000000000000000000'
+      if (!storage[slotKey] && slotKey !== self.zeroSlot) { // we don't cache the zero slot (could lead to inconsistency)
+        storage[slotKey] = {
+          key: slotKey,
+          value: self.zeroSlot
+        }
+      }
+      self.toCache(self, address, storage)
+      if (slotKey === self.zeroSlot && !nextKey) { // only working if keys are sorted !!
+        self.storageByAddress[address].complete = true
+      }
+      callback(null, storage)
+    })
+  }
 
-/**
-  * retrieve the storage from the cache. if @arg slot is defined, return only the desired slot, if not return the entire known storage
-  *
-  * @param {String} address  - contract address
-  * @return {String} - either the entire known storage or a single value
-  */
-function fromCache (self, address) {
-  if (!self.storageByAddress[address]) {
-    return null
+  /**
+   * retrieve the storage from the cache. if @arg slot is defined, return only the desired slot, if not return the entire known storage
+   *
+   * @param {String} address  - contract address
+   * @return {String} - either the entire known storage or a single value
+   */
+  fromCache (self, address) {
+    if (!self.storageByAddress[address]) {
+      return null
+    }
+    return self.storageByAddress[address]
   }
-  return self.storageByAddress[address]
-}
 
-/**
-  * store the result of `storageRangeAtInternal`
-  *
-  * @param {String} address  - contract address
-  * @param {Object} storage  - result of `storageRangeAtInternal`, contains {key, hashedKey, value}
-  */
-function toCache (self, address, storage) {
-  if (!self.storageByAddress[address]) {
-    self.storageByAddress[address] = {}
+  /**
+   * store the result of `storageRangeAtInternal`
+   *
+   * @param {String} address  - contract address
+   * @param {Object} storage  - result of `storageRangeAtInternal`, contains {key, hashedKey, value}
+   */
+  toCache (self, address, storage) {
+    if (!self.storageByAddress[address]) {
+      self.storageByAddress[address] = {}
+    }
+    self.storageByAddress[address].storage = Object.assign(self.storageByAddress[address].storage || {}, storage)
   }
-  self.storageByAddress[address].storage = Object.assign(self.storageByAddress[address].storage || {}, storage)
-}
 
-function storageRangeWeb3Call (tx, address, start, maxSize, callback) {
-  if (traceHelper.isContractCreation(address)) {
-    callback(null, {}, null)
-  } else {
-    global.web3Debug.debug.storageRangeAt(
-      tx.blockHash, tx.transactionIndex === undefined ? tx.hash : tx.transactionIndex,
-      address,
-      start,
-      maxSize,
-      (error, result) => {
-        if (error) {
-          callback(error)
-        } else if (result.storage) {
-          callback(null, result.storage, result.nextKey)
-        } else {
-          callback('the storage has not been provided')
-        }
-      })
+  storageRangeWeb3Call (tx, address, start, maxSize, callback) {
+    if (traceHelper.isContractCreation(address)) {
+      callback(null, {}, null)
+    } else {
+      this.web3.debug.storageRangeAt(
+        tx.blockHash, tx.transactionIndex === undefined ? tx.hash : tx.transactionIndex,
+        address,
+        start,
+        maxSize,
+        (error, result) => {
+          if (error) {
+            callback(error)
+          } else if (result.storage) {
+            callback(null, result.storage, result.nextKey)
+          } else {
+            callback('the storage has not been provided')
+          }
+        })
+    }
   }
 }
 
diff --git a/remix-core/src/storage/storageViewer.js b/remix-core/src/storage/storageViewer.js
index eee40708eb..21af4d5f38 100644
--- a/remix-core/src/storage/storageViewer.js
+++ b/remix-core/src/storage/storageViewer.js
@@ -12,6 +12,7 @@ class StorageViewer {
   constructor (_context, _storageResolver, _traceManager) {
     this.context = _context
     this.storageResolver = _storageResolver
+    this.web3 = this.storageResolver.web3
     this.initialMappingsLocationPromise = null
     this.currentMappingsLocationPromise = null
     _traceManager.accumulateStorageChanges(this.context.stepIndex, this.context.address, {}, (error, storageChanges) => {
@@ -117,7 +118,7 @@ class StorageViewer {
     if (this.mappingsLocationChanges) {
       return callback(null, this.mappingsLocationChanges)
     }
-    mappingPreimages.decodeMappingsKeys(storageChanges, (error, mappings) => {
+    mappingPreimages.decodeMappingsKeys(this.web3, storageChanges, (error, mappings) => {
       if (!error) {
         this.mappingsLocationChanges = mappings
         return callback(null, this.mappingsLocationChanges)
diff --git a/remix-core/src/trace/traceManager.js b/remix-core/src/trace/traceManager.js
index d9eefd688f..8db9b95157 100644
--- a/remix-core/src/trace/traceManager.js
+++ b/remix-core/src/trace/traceManager.js
@@ -6,14 +6,14 @@ var TraceStepManager = require('./traceStepManager')
 var remixLib = require('remix-lib')
 var traceHelper = remixLib.helpers.trace
 var util = remixLib.util
-var global = remixLib.global
 
-function TraceManager () {
+function TraceManager (options) {
+  this.web3 = options.web3
   this.isLoading = false
   this.trace = null
   this.traceCache = new TraceCache()
   this.traceAnalyser = new TraceAnalyser(this.traceCache)
-  this.traceRetriever = new TraceRetriever()
+  this.traceRetriever = new TraceRetriever({web3: this.web3})
   this.traceStepManager = new TraceStepManager(this.traceAnalyser)
   this.tx
 }
@@ -22,7 +22,7 @@ function TraceManager () {
 TraceManager.prototype.resolveTrace = function (tx, callback) {
   this.tx = tx
   this.init()
-  if (!global.web3) callback('web3 not loaded', false)
+  if (!this.web3) callback('web3 not loaded', false)
   this.isLoading = true
   var self = this
   this.traceRetriever.getTrace(tx.hash, function (error, result) {
diff --git a/remix-core/src/trace/traceRetriever.js b/remix-core/src/trace/traceRetriever.js
index 895daad471..07e757c0f0 100644
--- a/remix-core/src/trace/traceRetriever.js
+++ b/remix-core/src/trace/traceRetriever.js
@@ -1,8 +1,7 @@
 'use strict'
-var remixLib = require('remix-lib')
-var global = remixLib.global
 
-function TraceRetriever () {
+function TraceRetriever (options) {
+  this.web3 = options.web3
 }
 
 TraceRetriever.prototype.getTrace = function (txHash, callback) {
@@ -12,7 +11,7 @@ TraceRetriever.prototype.getTrace = function (txHash, callback) {
     disableStack: false,
     fullStorage: false
   }
-  global.web3Debug.debug.traceTransaction(txHash, options, function (error, result) {
+  this.web3.debug.traceTransaction(txHash, options, function (error, result) {
     callback(error, result)
   })
 }
diff --git a/remix-core/test/codeManager.js b/remix-core/test/codeManager.js
index 5795bfaf33..a0709226de 100644
--- a/remix-core/test/codeManager.js
+++ b/remix-core/test/codeManager.js
@@ -5,7 +5,8 @@ var Web3Providers = remixLib.vm.Web3Providers
 var TraceManager = require('../src/trace/traceManager')
 var CodeManager = require('../src/code/codeManager')
 var web3Test = require('./resources/testWeb3')
-var global = remixLib.global
+
+let web3 = null
 
 tape('CodeManager', function (t) {
   var codeManager
@@ -17,12 +18,12 @@ tape('CodeManager', function (t) {
       console.log(mes)
       t.fail(mes)
     } else {
-      global.web3 = obj
-      var traceManager = new TraceManager()
+      web3 = obj
+      var traceManager = new TraceManager({web3: web3})
       codeManager = new CodeManager(traceManager)
-      var contractCode = global.web3.eth.getCode('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5')
+      var contractCode = web3.eth.getCode('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5')
       codeManager.codeResolver.cacheExecutingCode('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5', contractCode) // so a call to web3 is not necessary
-      var tx = global.web3.eth.getTransaction('0x20ef65b8b186ca942fcccd634f37074dde49b541c27994fc7596740ef44cfd51')
+      var tx = web3.eth.getTransaction('0x20ef65b8b186ca942fcccd634f37074dde49b541c27994fc7596740ef44cfd51')
       traceManager.resolveTrace(tx, function (error, result) {
         if (error) {
           t.fail(' - traceManager.resolveTrace - failed ' + result)
@@ -63,7 +64,7 @@ function continueTesting (t, codeManager) {
         }
       }
     })
-    var tx = global.web3.eth.getTransaction('0x20ef65b8b186ca942fcccd634f37074dde49b541c27994fc7596740ef44cfd51')
+    var tx = web3.eth.getTransaction('0x20ef65b8b186ca942fcccd634f37074dde49b541c27994fc7596740ef44cfd51')
     codeManager.resolveStep(0, tx)
     codeManager.resolveStep(70, tx)
   })
diff --git a/remix-core/test/traceManager.js b/remix-core/test/traceManager.js
index c45ba3fd1d..053b07ea3c 100644
--- a/remix-core/test/traceManager.js
+++ b/remix-core/test/traceManager.js
@@ -3,9 +3,10 @@ var TraceManager = require('../src/trace/traceManager')
 var tape = require('tape')
 var remixLib = require('remix-lib')
 var Web3Providers = remixLib.vm.Web3Providers
-var global = remixLib.global
 var web3Test = require('./resources/testWeb3')
 
+let web3 = null
+
 tape('TraceManager', function (t) {
   var traceManager
 
@@ -18,16 +19,15 @@ tape('TraceManager', function (t) {
         console.log(mes)
         st.fail(mes)
       } else {
-        global.web3 = obj
-        global.web3Debug = obj
-        traceManager = new TraceManager()
+        web3 = obj
+        traceManager = new TraceManager({web3: web3})
         st.end()
       }
     })
   })
 
   t.test('TraceManager.resolveTrace', function (st) {
-    var tx = global.web3.eth.getTransaction('0x20ef65b8b186ca942fcccd634f37074dde49b541c27994fc7596740ef44cfd51')
+    var tx = web3.eth.getTransaction('0x20ef65b8b186ca942fcccd634f37074dde49b541c27994fc7596740ef44cfd51')
     traceManager.resolveTrace(tx, function (error, result) {
       if (error) {
         st.fail(' - traceManager.resolveTrace - failed ' + result)
diff --git a/remix-debug/src/Ethdebugger.js b/remix-debug/src/Ethdebugger.js
index 12b4c2839d..6f63c9e8ee 100644
--- a/remix-debug/src/Ethdebugger.js
+++ b/remix-debug/src/Ethdebugger.js
@@ -4,7 +4,6 @@ var TraceManager = remixCore.trace.TraceManager
 var StorageViewer = remixCore.storage.StorageViewer
 var remixLib = require('remix-lib')
 var traceHelper = remixLib.helpers.trace
-var global = remixLib.global
 var init = remixLib.init
 var executionContext = remixLib.execution.executionContext
 var EventManager = remixLib.EventManager
@@ -35,6 +34,8 @@ function Ethdebugger (opts) {
   this.opts = opts || {}
   if (!this.opts.compilationResult) this.opts.compilationResult = () => { return null }
 
+  this.web3 = opts.web3
+
   this.event = new EventManager()
 
   this.tx
@@ -43,7 +44,16 @@ function Ethdebugger (opts) {
   this.addProvider('DUMMYWEB3', new DummyProvider())
   this.switchProvider('DUMMYWEB3')
 
-  this.traceManager = new TraceManager()
+  this.traceManager = new TraceManager({web3: this.web3})
+  this.codeManager = new CodeManager(this.traceManager)
+  this.solidityProxy = new SolidityProxy(this.traceManager, this.codeManager)
+  this.storageResolver = null
+
+  this.callTree = new InternalCallTree(this.event, this.traceManager, this.solidityProxy, this.codeManager, { includeLocalVariables: true })
+}
+
+Ethdebugger.prototype.setManagers = function () {
+  this.traceManager = new TraceManager({web3: this.web3})
   this.codeManager = new CodeManager(this.traceManager)
   this.solidityProxy = new SolidityProxy(this.traceManager, this.codeManager)
   this.storageResolver = null
@@ -152,7 +162,7 @@ Ethdebugger.prototype.storageViewAt = function (step, address) {
 }
 /* set env */
 Ethdebugger.prototype.web3 = function () {
-  return global.web3
+  return this.web3
 }
 
 Ethdebugger.prototype.addProvider = function (type, obj) {
@@ -166,14 +176,19 @@ Ethdebugger.prototype.switchProvider = function (type) {
     if (error) {
       console.log('provider ' + type + ' not defined')
     } else {
-      global.web3 = obj
+      self.web3 = obj
+      self.setManagers()
+      // self.traceManager.web3 = self.web3
       executionContext.detectNetwork((error, network) => {
         if (error || !network) {
-          global.web3Debug = obj
+          self.web3Debug = obj
+          self.web3 = obj
         } else {
           var webDebugNode = init.web3DebugNode(network.name)
-          global.web3Debug = !webDebugNode ? obj : webDebugNode
+          self.web3Debug = !webDebugNode ? obj : webDebugNode
+          self.web3 = !webDebugNode ? obj : webDebugNode
         }
+        self.setManagers()
       })
       self.event.trigger('providerChanged', [type])
     }
@@ -214,7 +229,7 @@ Ethdebugger.prototype.debug = function (tx) {
       if (self.breakpointManager && self.breakpointManager.hasBreakpoint()) {
         self.breakpointManager.jumpNextBreakpoint(false)
       }
-      self.storageResolver = new StorageResolver()
+      self.storageResolver = new StorageResolver({web3: self.traceManager.web3})
     } else {
       self.statusMessage = error ? error.message : 'Trace not loaded'
     }
diff --git a/remix-debug/test/vmCall.js b/remix-debug/test/vmCall.js
index 11abc857a0..a57e3114c5 100644
--- a/remix-debug/test/vmCall.js
+++ b/remix-debug/test/vmCall.js
@@ -51,8 +51,7 @@ function initVM (st, privateKey) {
       console.log(mes)
       st.fail(mes)
     } else {
-      remixLib.global.web3 = obj
-      remixLib.global.web3Debug = obj
+      vm.web3 = obj
     }
   })
   return vm
diff --git a/remix-lib/README.md b/remix-lib/README.md
index b74082bf78..566c21c99d 100644
--- a/remix-lib/README.md
+++ b/remix-lib/README.md
@@ -18,9 +18,7 @@ Provides:
         init: init,
         util: util,
         AstWalker: AstWalker,
-        global: global,
         ui: {
             styleGuide: styleGuide
         }
-        }
     }
diff --git a/remix-lib/index.js b/remix-lib/index.js
index 566a21728b..3e28b78028 100644
--- a/remix-lib/index.js
+++ b/remix-lib/index.js
@@ -11,7 +11,6 @@ var Web3Providers = require('./src/web3Provider/web3Providers')
 var DummyProvider = require('./src/web3Provider/dummyProvider')
 var Web3VMProvider = require('./src/web3Provider/web3VmProvider')
 var AstWalker = require('./src/astWalker')
-var global = require('./src/global')
 var Storage = require('./src/storage')
 
 var EventsDecoder = require('./src/execution/eventsDecoder')
@@ -50,7 +49,6 @@ function modules () {
     init: init,
     util: util,
     AstWalker: AstWalker,
-    global: global,
     execution: {
       EventsDecoder: EventsDecoder,
       txExecution: txExecution,
diff --git a/remix-lib/src/global.js b/remix-lib/src/global.js
deleted file mode 100644
index 9344a577cf..0000000000
--- a/remix-lib/src/global.js
+++ /dev/null
@@ -1,4 +0,0 @@
-module.exports = {
-  web3: null,
-  web3Debug: null // this node should support the debug endpoint
-}
diff --git a/remix-solidity/test/decoder/localsTests/int.js b/remix-solidity/test/decoder/localsTests/int.js
index 62cc201429..c86cf336e7 100644
--- a/remix-solidity/test/decoder/localsTests/int.js
+++ b/remix-solidity/test/decoder/localsTests/int.js
@@ -6,7 +6,6 @@ var vmCall = require('../vmCall')
 var remixLib = require('remix-lib')
 
 var traceHelper = remixLib.helpers.trace
-var global = remixLib.global
 var SolidityProxy = require('../../../src/decoder/solidityProxy')
 var InternalCallTree = require('../../../src/decoder/internalCallTree')
 var EventManager = remixLib.EventManager
@@ -17,12 +16,12 @@ module.exports = function (st, vm, privateKey, contractBytecode, compilationResu
     if (error) {
       st.fail(error)
     } else {
-      global.web3.getTransaction(txHash, function (error, tx) {
+      vm.web3.eth.getTransaction(txHash, function (error, tx) {
         if (error) {
           st.fail(error)
         } else {
           tx.to = traceHelper.contractCreationToken('0')
-          var traceManager = new TraceManager()
+          var traceManager = new TraceManager({web3: vm.web3})
           var codeManager = new CodeManager(traceManager)
           codeManager.clear()
           var solidityProxy = new SolidityProxy(traceManager, codeManager)
diff --git a/remix-solidity/test/decoder/localsTests/misc.js b/remix-solidity/test/decoder/localsTests/misc.js
index 684e0812cc..be37d59e49 100644
--- a/remix-solidity/test/decoder/localsTests/misc.js
+++ b/remix-solidity/test/decoder/localsTests/misc.js
@@ -5,7 +5,6 @@ var CodeManager = remixCore.code.CodeManager
 var vmCall = require('../vmCall')
 var remixLib = require('remix-lib')
 var traceHelper = remixLib.helpers.trace
-var global = remixLib.global
 var SolidityProxy = require('../../../src/decoder/solidityProxy')
 var InternalCallTree = require('../../../src/decoder/internalCallTree')
 var EventManager = remixLib.EventManager
@@ -16,12 +15,12 @@ module.exports = function (st, vm, privateKey, contractBytecode, compilationResu
     if (error) {
       st.fail(error)
     } else {
-      global.web3.getTransaction(txHash, function (error, tx) {
+      vm.web3.eth.getTransaction(txHash, function (error, tx) {
         if (error) {
           st.fail(error)
         } else {
           tx.to = traceHelper.contractCreationToken('0')
-          var traceManager = new TraceManager()
+          var traceManager = new TraceManager({web3: vm.web3})
           var codeManager = new CodeManager(traceManager)
           codeManager.clear()
           var solidityProxy = new SolidityProxy(traceManager, codeManager)
diff --git a/remix-solidity/test/decoder/localsTests/misc2.js b/remix-solidity/test/decoder/localsTests/misc2.js
index 69d9bb0ccc..78cd2745f4 100644
--- a/remix-solidity/test/decoder/localsTests/misc2.js
+++ b/remix-solidity/test/decoder/localsTests/misc2.js
@@ -5,7 +5,6 @@ var CodeManager = remixCore.code.CodeManager
 var vmCall = require('../vmCall')
 var remixLib = require('remix-lib')
 var traceHelper = remixLib.helpers.trace
-var global = remixLib.global
 var SolidityProxy = require('../../../src/decoder/solidityProxy')
 var InternalCallTree = require('../../../src/decoder/internalCallTree')
 var EventManager = remixLib.EventManager
@@ -16,12 +15,12 @@ module.exports = function (st, vm, privateKey, contractBytecode, compilationResu
     if (error) {
       st.fail(error)
     } else {
-      global.web3.getTransaction(txHash, function (error, tx) {
+      vm.web3.eth.getTransaction(txHash, function (error, tx) {
         if (error) {
           st.fail(error)
         } else {
           tx.to = traceHelper.contractCreationToken('0')
-          var traceManager = new TraceManager()
+          var traceManager = new TraceManager({web3: vm.web3})
           var codeManager = new CodeManager(traceManager)
           codeManager.clear()
           var solidityProxy = new SolidityProxy(traceManager, codeManager)
diff --git a/remix-solidity/test/decoder/localsTests/structArray.js b/remix-solidity/test/decoder/localsTests/structArray.js
index 3a3d0014d6..8e6865e18f 100644
--- a/remix-solidity/test/decoder/localsTests/structArray.js
+++ b/remix-solidity/test/decoder/localsTests/structArray.js
@@ -5,7 +5,6 @@ var CodeManager = remixCore.code.CodeManager
 var vmCall = require('../vmCall')
 var remixLib = require('remix-lib')
 var traceHelper = remixLib.helpers.trace
-var global = remixLib.global
 var SolidityProxy = require('../../../src/decoder/solidityProxy')
 var InternalCallTree = require('../../../src/decoder/internalCallTree')
 var EventManager = remixLib.EventManager
@@ -16,12 +15,12 @@ module.exports = function (st, vm, privateKey, contractBytecode, compilationResu
     if (error) {
       st.fail(error)
     } else {
-      global.web3.getTransaction(txHash, function (error, tx) {
+      vm.web3.eth.getTransaction(txHash, function (error, tx) {
         if (error) {
           st.fail(error)
         } else {
           tx.to = traceHelper.contractCreationToken('0')
-          var traceManager = new TraceManager()
+          var traceManager = new TraceManager({web3: vm.web3})
           var codeManager = new CodeManager(traceManager)
           codeManager.clear()
           var solidityProxy = new SolidityProxy(traceManager, codeManager)
diff --git a/remix-solidity/test/decoder/stateTests/mapping.js b/remix-solidity/test/decoder/stateTests/mapping.js
index 8c3cea1675..9d587f1d74 100644
--- a/remix-solidity/test/decoder/stateTests/mapping.js
+++ b/remix-solidity/test/decoder/stateTests/mapping.js
@@ -15,7 +15,7 @@ module.exports = function testMappingStorage (st, cb) {
       console.log(error)
       st.end(error)
     } else {
-      remixLib.global.web3.eth.getTransaction(txHash, (error, tx) => {
+      vm.web3.eth.getTransaction(txHash, (error, tx) => {
         if (error) {
           console.log(error)
           st.end(error)
@@ -35,13 +35,13 @@ function testMapping (st, vm, privateKey, contractAddress, output, cb) {
             st.end(error)
           } else {
             console.log(txHash)
-            remixLib.global.web3.eth.getTransaction(txHash, (error, tx) => {
+            vm.web3.eth.getTransaction(txHash, (error, tx) => {
               if (error) {
                 console.log(error)
                 st.end(error)
               } else {
                 var TraceManager = require('remix-core').trace.TraceManager
-                var traceManager = new TraceManager()
+                var traceManager = new TraceManager({web3: vm.web3})
                 traceManager.resolveTrace(tx, () => {
                   var StorageResolver = require('remix-core').storage.StorageResolver
                   var StorageViewer = require('remix-core').storage.StorageViewer
@@ -49,7 +49,7 @@ function testMapping (st, vm, privateKey, contractAddress, output, cb) {
                     stepIndex: 213,
                     tx: tx,
                     address: contractAddress
-                  }, new StorageResolver(), traceManager)
+                  }, new StorageResolver({web3: vm.web3}), traceManager)
                   var stateVars = stateDecoder.extractStateVariables('SimpleMappingState', output.sources)
                   stateDecoder.decodeState(stateVars, storageViewer).then((result) => {
                     console.log('ok', JSON.stringify(result))
diff --git a/remix-solidity/test/decoder/vmCall.js b/remix-solidity/test/decoder/vmCall.js
index 11abc857a0..a57e3114c5 100644
--- a/remix-solidity/test/decoder/vmCall.js
+++ b/remix-solidity/test/decoder/vmCall.js
@@ -51,8 +51,7 @@ function initVM (st, privateKey) {
       console.log(mes)
       st.fail(mes)
     } else {
-      remixLib.global.web3 = obj
-      remixLib.global.web3Debug = obj
+      vm.web3 = obj
     }
   })
   return vm