Examine source code of GitHoard - Quick Clone

{
  "manifest_version" : 2 ,
  "name" : "GitHoard - Quick Clone",
  "version" : "0.1.3",
  "description" : "Show GitHoard clone button on websites with links to Git repositories",
  "homepage_url" : "https://github.com/jojobyte/githoard-firefox",
  "icons" : {
    "48" : "icons/48.png",
    "96" : "icons/96.png"
  },
  "permissions" : [
    "bookmarks" ,
    "tabs" 
  ],
  "browser_action" : {
    "default_icon" : "icons/38-bizaro.png",
    "default_title" : "GitHoard"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "check-git.js" 
      ]
    }
  ],
  "web_accessible_resources" : [
    "icons/19.png",
    "icons/19-bizaro.png",
    "icons/24.png",
    "icons/38.png",
    "icons/38-bizaro.png",
    "icons/48.png",
    "icons/96.png"
  ]
}