Examine source code of Github One-Click Commit

{
  "manifest_version" : 2 ,
  "name" : "Github One-Click Commit",
  "description" : "Commit custom mesages with a single click on Github! Silly idea from @HackerNewsOnion",
  "version" : "1.3resigned1",
  "icons" : {
    "32" : "icon32.png",
    "200" : "icon200.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://github.com/*" 
      ],
      "js" : [
        "index.js" 
      ]
    }
  ],
  "permissions" : [
    "storage" 
  ],
  "options_ui" : {
    "page": "options.html" 
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{542595ef-aa8e-4135-ac66-f251f8d7917c}"
    }
  }
}