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

edit July 11th: my youtube theme works again so im not facing that problem, still i will continue to look into this

edit October 13rd: the comment box being translucent is a bug and i just updated the add-on, you can go to about:addons, click the cogwheel icon, and click "Check for Updates". sorry if it took me 3 months to fix such a simple bug, im also busy with school!