Examine source code of FFQRcoder

{
  "manifest_version" : 2 ,
  "name" : "__MSG_name__" ,
  "version" : "2.1resigned1",
  "description" : "__MSG_description__" ,
  "icons" : {
    "16" : "images/icon16_b.png",
    "48" : "images/icon48.png",
    "128" : "images/icon128.png"
  },
  "author": "1011.0011@163.com",
  "background" : {
    "scripts" : [
      "eventPage.js" 
    ]
  },
  "page_action" : {
    "browser_style": true,
    "default_icon" : {
      "16" : "images/icon16.png",
      "24" : "images/icon24.png",
      "32" : "images/icon32.png"
    },
    "default_title" : "__MSG_alert__" 
  },
  "homepage_url" : "https://github.com/zhcong/firefox-qrcoder",
  "permissions" : [
    "tabs" ,
    "notifications" ,
    "contextMenus" ,
    "http://*/" ,
    "https://*/" ,
    "ftp://*/" ,
    "storage" ,
    "menus" 
  ],
  "web_accessible_resources" : [
    "images/close.svg"
  ],
  "default_locale" : "en-US" ,
  "options_ui" : {
    "page": "options/options.html" ,
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af8e2c92-7e14-42b5-9722-2b8f8701ce28}"
    }
  }
}