Examine source code of Tab Modifier ff

{
  "manifest_version": 2,
  "name": "Tab Modifier",
  "version": "1.0.1",
  "description": "Customize tab titles and favicons with URL-based rules using exact, prefix, or regex matching.",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png"
  },
  "browser_action": {
    "default_title": "Tab Name & Favicon Rules",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rule-tab-renamer@example.local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}