Examine source code of Wider GitHub

{
  "manifest_version": 2,
  "name": "WideGitHub",
  "version": "1.0",
  "description": "Wide GitHub",
  "icons": {
    "128": "icons/fit.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "wide_github.js"
      ]
    }
  ]
}