Examine source code of Tab Collections

{
  "manifest_version": 3,
  "name": "Tab Collections",
  "version": "1.0.0",
  "description": "Save/restore named sets of tabs and copy current window URLs.",
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-collections@local.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icon-16.png",
      "32": "assets/icon-32.png",
      "48": "assets/icon-48.png",
      "128": "assets/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "tabs",
    "storage",
    "clipboardWrite",
    "contextMenus"
  ],
  "commands": {
    "save-current-window": {
      "suggested_key": {
        "default": "Ctrl+Shift+S"
      },
      "description": "Save Current Window as Collection"
    },
    "copy-current-window-urls": {
      "suggested_key": {
        "default": "Ctrl+Shift+C"
      },
      "description": "Copy URLs of Current Window"
    }
  },
  "icons": {
    "16": "assets/icon-16.png",
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  }
}