Examine source code of M-Proxy IP Monkey v2.0

{
  "manifest_version": 2,
  "name": "M-Proxy IP Monkey v2.0",
  "version": "2.0",
  "description": "get public/free proxies list from accountantandprogrammer.com/m-proxy and select from them to use by changing the browser settings, NOTE: you need to have account to get the proxies list from our servers",
  "icons": {
    "48": "icons/ip-monkey-logo.png"
  },
  "background": {
    "scripts": [
      "/background_scripts/background_script_1.js"
    ]
  },
  "permissions": [
    "proxy",
    "webRequest",
    "*://*/*"
  ],
  "applications": {
    "gecko": {
      "id": "do-not-spam-me-ip-monkey@accountantandprogrammer.com"
    }
  },
  "browser_action": {
    "default_icon": "icons/ip-monkey-logo.png",
    "default_title": "M-Proxy IP Monkey v2.0",
    "default_popup": "popup/popup.html"
  }
}