Examine source code of GitHub Saved Filters

{
  "name" : "GitHub Saved Filters",
  "version" : "1.0.4",
  "description" : "Allows to save issue and pull request filters on GitHub and access them via the main menu.",
  "manifest_version" : 2 ,
  "icons" : {
    "128" : "assets/icon.png"
  },
  "content_scripts" : [
    {
      "js" : [
        "browser-polyfill.js" ,
        "content.js" 
      ],
      "matches" : [
        "https://github.com/*" 
      ]
    }
  ],
  "permissions" : [
    "storage" 
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{071e944b-8d1c-4b48-8bba-4c2519deee01}"
    }
  }
}