Examine source code of Chameleon UA Switcher

{
  "manifest_version": 2,
  "name": "Chameleon UA Switcher",
  "version": "1.0.0",
  "description": "The web, in every color.",
  "icons": {
    "48": "logo.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "logo.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "chameleon-ua-switcher@kernelshark",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}