Examine source code of Free GitHub

{
  "manifest_version" : 2 ,
  "name" : "FreeGitHub",
  "version" : "1.1",
  "homepage_url" : "https://github.com/arsalanses/freegithub",
  "description" : "Remove warning on top of GitHub.com",
  "icons" : {
    "48" : "icons/github-48.png",
    "96" : "icons/github-96.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "*://*.github.com/*" 
      ],
      "js" : [
        "omit.js" 
      ]
    }
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_action" : {
    "default_icon" : {
      "16" : "icons/toolbar-16.png",
      "32" : "icons/toolbar-32.png"
    },
    "default_title" : "Free GitHub"
  }
}