Examine source code of URL Modifier by Gerbil

{
  "manifest_version": 3,
  "name": "URL Modifier",
  "version": "1.0.4",
  "description": "Rewrite HTTP/HTTPS request URLs using regex rules — before, replace, or after the matched pattern.",
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/background/background.js"
    ]
  },
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "src/icons/icon-16.png",
      "32": "src/icons/icon-32.png",
      "48": "src/icons/icon-48.png",
      "128": "src/icons/icon-128.png"
    },
    "default_title": "URL Modifier"
  },
  "icons": {
    "16": "src/icons/icon-16.png",
    "32": "src/icons/icon-32.png",
    "48": "src/icons/icon-48.png",
    "128": "src/icons/icon-128.png"
  },
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "url-modifier@gerbilurlmodifier",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}