Examine source code of AgentFox

{
  "manifest_version": 2,
  "name": "AgentFox",
  "version": "1.2",
  "description": "Randomize your user agent in all outgoing requests.",
  "icons": {
    "48": "icons/fox_48.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "declarativeNetRequest",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "view/settings.html",
    "default_icon": {
      "48": "icons/fox_48.png"
    }
  },
  "background": {
    "scripts": [
      "dist/agent.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{148188d8-e330-481c-a496-85b056253783}"
    }
  }
}