Examine source code of OneSidebar - GitHub Navigator

{
  "browser_action" : {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{af81a170-dd11-4210-9c85-bb922d00a659}"
    }
  },
  "content_scripts" : [
    {
      "css" : [
        "main.css" 
      ],
      "js" : [
        "main.js" 
      ],
      "matches" : [
        "https://github.com/*" 
      ],
      "run_at" : "document_start" 
    }
  ],
  "description" : "The missing navigator of GitHub. No longer having to open too many tabs! Your files, issues, notifications are a single click away!",
  "icons" : {
    "16" : "icon16.png",
    "48" : "icon48.png",
    "96" : "icon96.png",
    "128" : "icon128.png",
    "512" : "icon512.png"
  },
  "manifest_version" : 2 ,
  "name" : "OneSidebar - GitHub Navigator",
  "permissions" : [
    "storage" 
  ],
  "version" : "1.6",
  "web_accessible_resources" : [
    "assets/*"
  ]
}