Examine source code of Proxy Manager

{
  "name": "Proxy Manager",
  "description": "Configure the methodology to dynamically obtain a fresh list of proxy servers. Enable the use of a proxy for all tabs, or for individual tabs. At any time, refresh the proxy list or switch the proxy in use.",
  "version": "2.1.0",
  "manifest_version": 2,
  "icons": {
    "16": "icons/aperture-999-16.png",
    "32": "icons/aperture-999-32.png",
    "48": "icons/aperture-999-48.png",
    "128": "icons/aperture-999-128.png"
  },
  "background": {
    "scripts": [
      "popup/js/common.js",
      "popup/js/common.templates.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/aperture-999-16.png",
      "32": "icons/aperture-999-32.png",
      "48": "icons/aperture-999-48.png",
      "128": "icons/aperture-999-128.png"
    },
    "default_title": "Proxy Manager",
    "default_popup": "popup/menu.html"
  },
  "permissions": [
    "activeTab",
    "proxy",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "content_security_policy": "default-src *; connect-src *; script-src 'self' 'unsafe-eval'",
  "browser_specific_settings": {
    "gecko": {
      "id": "moz-proxy-manager@warren-bank.github.io",
      "strict_min_version": "91.1.0"
    }
  },
  "homepage_url": "https://github.com/warren-bank/moz-proxy-manager"
}