thank you for the kind words!
sorry to ask but can you elaborate on that by making an issue on the github repo? because firefox review doesn't let you upload images i can't envision what you're dealing with on your end

here's the repo: https://github.com/nhantrichuyenanh/youtube-timestamps/issues

edit July 3rd: because my youtube theme broke, i also encounter the same problem that you're facing. I'll look into this