Examine source code of Browser Automaton

{
  "manifest_version": 2,
  "name": "Browser Automaton",
  "description": "Run remote script to do browser automation",
  "version": "3.0",
  "icons": {
    "16": "application-x-executable-16.png",
    "24": "application-x-executable-24.png",
    "32": "application-x-executable-32.png",
    "48": "application-x-executable-48.png",
    "128": "application-x-executable-128.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "http://*/*",
    "https://*/*",
    "webNavigation",
    "storage"
  ],
  "background": {
    "scripts": [
      "application.js"
    ]
  },
  "browser_action": {
    "default_icon": "application-x-executable-128.png",
    "default_title": "Browser Automaton"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "browser.automaton@xyosecurity.ro",
      "strict_min_version": "57.0"
    }
  }
}