remix-project/manifest.json

{
  "manifest_version": 2,

  "name": "Solidity",
  "description": "Realtime compiler and runtime",
  "devtools_page": "devtools.html",
  "update_url": "https://chriseth.github.io/browser-solidity/",
  "version": "1.1",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"],
    "persistent": true
  },

  "icons": {
    "32": "icon.png"
  },

  "browser_action": {
    "default_icon": "icon.png"
  },
  
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "https://ajax.googleapis.com/",
    "webRequest",
    "webRequestBlocking",
    "\u003Call_urls>"
  ]
}