Examine source code of Easy Github1s

{
  "description" : "easy jump to github1s",
  "author": "hycares",
  "manifest_version" : 2 ,
  "name" : "Easy Github1s",
  "version" : "1.0.0",
  "icons" : {
    "32" : "icons/g1s-32.png",
    "48" : "icons/g1s-48.png",
    "96" : "icons/g1s-96.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "*://github.com/*" 
      ],
      "js" : [
        "content.js" 
      ]
    }
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "permissions" : [
    "tabs" ,
    "*://github.com/*/*" 
  ],
  "page_action" : {
    "default_title" : "Open in GitHub1s",
    "default_icon" : {
      "48" : "icons/g1s-48.png",
      "96" : "icons/g1s-96.png"
    },
    "show_matches": [
      "*://github.com/*/*"
    ]
  },
  "applications": {
    "gecko": {
      "id": "noreplay@null.com"
    }
  }
}