Examine source code of Tab Memory Manager

{
  "manifest_version": 3,
  "name": "Tab Memory Manager",
  "version": "1.0.2",
  "description": "See estimated memory per tab, hibernate or close idle tabs in one click. Everything stays on your device.",
  "permissions": [
    "tabs",
    "tabGroups",
    "storage",
    "alarms",
    "scripting"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Tab Memory Manager",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-memory-manager@mohan.dev",
      "strict_min_version": "139.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "personallyIdentifyingInfo"
        ]
      }
    }
  }
}