Examine source code of FriendlyGit

{
  "manifest_version": 2,
  "name": "FriendlyGit",
  "version": "1.0",
  "description": "Makes the frontend of github.com more friendly to non-technical users.",
  "icons": {
    "48": "icons/logo48.png",
    "96": "icons/logo96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "friendlygit.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e4a8eb4c-f86b-4cb6-b68e-46570d320d7b}"
    }
  }
}