Examine source code of Proxy by Magus

{
  "manifest_version" : 2 ,
  "name" : "Proxy by Magus",
  "version" : "3.0.6",
  "description" : "Гибкий прокси-менеджер с per-tab режимом",
  "permissions" : [
    "proxy" ,
    "storage" ,
    "<all_urls>" ,
    "tabs" ,
    "webRequest" ,
    "webRequestBlocking" 
  ],
  "background" : {
    "scripts" : [
      "common.js" ,
      "background.js" 
    ]
  },
  "browser_action" : {
    "default_icon" : {
      "48" : "icon-proxy-off.png"
    },
    "default_title" : "Proxy",
    "default_popup" : "popup.html"
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "proxy-by-sites@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}