Examine source code of Save my tabs!

{
  "manifest_version": 3,
  "name": "Save my tabs!",
  "version": "2.1.2",
  "description": "Save all open tabs to a bookmark folder",
  "homepage_url": "https://github.com/salvoventura/save-my-tabs",
  "icons": {
    "32": "icons/iconfinder_tab_new_raised_18931.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d28e91e-0540-46e0-9f78-84bcdb32567c}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "bookmarks",
    "tabs",
    "alarms",
    "storage",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  },
  "action": {
    "default_icon": "icons/iconfinder_tab_new_raised_18931.png",
    "default_title": "Save my tabs!",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Open Save my tabs popup"
    }
  }
}