Examine source code of BestChange

{
  "manifest_version": 2,
  "name": "__MSG_appname__",
  "short_name": "BestChange",
  "version": "1.67",
  "description": "__MSG_appdesc__",
  "author": "BestChange",
  "default_locale": "en",
  "permissions": [
    "storage",
    "proxy",
    "webRequest",
    "declarativeNetRequest",
    "cookies",
    "*://bestchange.ru/*",
    "*://www.bestchange.ru/*",
    "*://bestchange.net/*",
    "*://www.bestchange.net/*",
    "*://bestchange.com/*",
    "*://www.bestchange.com/*",
    "*://bestchange.pro/*",
    "*://www.bestchange.pro/*",
    "*://bestchange.info/*",
    "*://www.bestchange.info/*"
  ],
  "browser_action": {
    "default_title": "BestChange",
    "default_icon": "images/19.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "images/16.png",
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "jid1-YEOTBtcPh77V9g@jetpack"
    }
  }
}