Examine source code of Browser Spoofer

{
  "manifest_version": 2,
  "name": "Browser Spoofer",
  "version": "1.0.0",
  "description": "Override the browser User-Agent header for all requests. Choose from desktop, mobile, and bot presets or enter custom.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d2a57e4-9c26-4a4e-b49d-c1a69f6950bf}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "96": "icon96.png",
      "128": "icon128.png"
    },
    "default_title": "Browser Spoofer",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}