There is no devtools.html to point to
@ -1,7 +1,6 @@
{
"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,