Examine source code of Tab Session Manager

{
  "manifest_version": 3,
  "version": "7.3.0",
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "Tab-Session-Manager@sienori"
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs",
    "tabGroups",
    "cookies",
    "downloads",
    "identity",
    "alarms"
  ],
  "optional_permissions": [
    "https://www.googleapis.com/*"
  ],
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon_min.svg",
    "64": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon_min.svg",
      "64": "icons/icon.svg"
    },
    "default_popup": "popup/index.html"
  },
  "commands": {
    "_execute_action": {
      "description": "__MSG_openPopupDescription__"
    },
    "saveAllWindow": {
      "description": "__MSG_saveAllWindowDescription__"
    },
    "saveCurrentWindow": {
      "description": "__MSG_saveCurrentWindowDescription__"
    },
    "exportSessions": {
      "description": "__MSG_exportSessionsDescription__"
    }
  }
}