Examine source code of Git Master

{
  "manifest_version" : 2 ,
  "name" : "__MSG_name__" ,
  "short_name" : "Git Master",
  "version" : "1.17.1",
  "default_locale" : "en" ,
  "icons" : {
    "16" : "assets/icons/favicon-16.png",
    "32" : "assets/icons/favicon-32.png",
    "48" : "assets/icons/favicon-48.png",
    "128" : "assets/icons/favicon-128.png"
  },
  "description" : "__MSG_pluginDesc__" ,
  "homepage_url" : "https://github.com/ineo6/git-master",
  "permissions" : [
    "*://*.github.com/*" ,
    "tabs" ,
    "activeTab" ,
    "storage" ,
    "alarms" ,
    "webRequest" ,
    "webNavigation" ,
    "https://api.github.com/*" 
  ],
  "optional_permissions" : [
    "<all_urls>" ,
    "notifications" 
  ],
  "web_accessible_resources" : [
    "*.woff2",
    "*.png",
    "*.gif",
    "inject.js"
  ],
  "content_security_policy" : "script-src 'self'; object-src 'self'",
  "author": "neo",
  "applications": {
    "gecko": {
      "id": "arklove@qq.com"
    }
  },
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "assets/icons/favicon-16.png",
      "32" : "assets/icons/favicon-32.png",
      "48" : "assets/icons/favicon-48.png",
      "128" : "assets/icons/favicon-128.png"
    },
    "default_title" : "GitMaster",
    "browser_style": false
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "background" : {
    "scripts" : [
      "js/background.bundle.js" 
    ]
  },
  "content_scripts" : [
    {
      "run_at" : "document_start" ,
      "matches" : [
        "http://*/*" ,
        "https://*/*" 
      ],
      "js" : [
        "js/contentScript.bundle.js" 
      ],
      "css" : [
        "css/contentScript.css" 
      ]
    }
  ]
}