Examine source code of 12VPX

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_appName__",
  "version": "2.0.8",
  "short_name": "12VPX",
  "minimum_chrome_version": "60",
  "description": "__MSG_appDesc__",
  "permissions": [
    "proxy",
    "notifications",
    "tabs",
    "dns",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "contextMenus",
    "unlimitedStorage",
    "privacy",
    "browserSettings",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "js/browser-polyfill.js",
      "js/jquery-3.3.1.min.js",
      "js/functions.js",
      "js/auth.js",
      "js/api.js",
      "js/actions.js",
      "js/common_proxy.js",
      "js/firefox_proxy.js",
      "js/ip.js",
      "js/tooltip.js",
      "js/debug.js",
      "js/12vpn.js"
    ]
  },
  "homepage_url": "https://12vpx.com/",
  "browser_action": {
    "default_icon": {
      "32": "img/12-blue.svg",
      "96": "img/12-blue.svg"
    },
    "default_popup": "popup.html"
  },
  "incognito": "spanning",
  "icons": {
    "32": "img/12-blue.svg",
    "96": "img/12-blue.svg",
    "128": "img/12-blue.svg"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "applications": {
    "gecko": {
      "id": "addon@12vpn.com",
      "strict_min_version": "60.0"
    }
  }
}