Examine source code of Better Tab Groups

{
  "manifest_version": 2,
  "name": "Better Tab Groups",
  "version": "3.5.0",
  "description": "Enhances Firefox tab groups with automatic merging, smart grouping suggestions, and rule-based tab organization.",
  "permissions": [
    "tabs",
    "tabGroups",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "popup.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon.svg",
      "32": "icons/icon.svg",
      "48": "icons/icon.svg",
      "64": "icons/icon.svg",
      "96": "icons/icon.svg",
      "128": "icons/icon.svg"
    },
    "default_title": "Better Tab Groups",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "denis.duchev@gmail.com",
      "strict_min_version": "139.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "139.0"
    }
  }
}