Examine source code of IP-HOST AUTO-HEADER

{
  "name": "IP-HOST AUTO-HEADER",
  "description": "https://github.com/szczyglis-dev/browser-ip-host-auto-header",
  "version": "1.2",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "background.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "16": "/images/icon16.png",
    "32": "/images/icon32.png",
    "48": "/images/icon48.png",
    "128": "/images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ip-host-auto-header@szczyglis.com"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "/images/icon16.png",
      "32": "/images/icon32.png"
    }
  }
}