In settings you find these options:
Turn off and on sound effects.
Choose between light and dark mode.
Clears out the thumbnail that you see when hovering your active tabs. The thumbnail is captured once a page is fully reloaded. The thumbnails are self-destroyed once they are not in the active tabs lists anymore.
Exports your current data as a JSON file(JSON is a lightweight format for storing and transporting data). Once exported the file will be located in your download folder.