there are bugs: the search returns also comments which do not include the search term!
e.g. searching this video https://www.youtube.com/watch?v=zZUOazRFLaA for "sortimo"
p.s. I think the error is at youtube because the web interface https://ytcomment.kmcat.uk/# returns the same results as your addon
p.s.2 https://hadzy.com/comments however works fine and i think is using the same api
edit: I used this add-on to search in the comments for just 2 youtube videos; it looks ok, but I would have colored the search terms in the result window;
I think you should complain to youtube about the error to have them fix their own bugs rather than rely on workarounds!
Is there another way we can communicate here except editing the review?
p.s.3 how about enabling Like/Dislike/Reply ?
can you implement this?

This addon has been working for me without any problems until now.
When i try to search a comment it tells me "Ups, something went wrong." I tried removing and readding the addon and also restarting firefox. Neither of which was succesful. Can you help me, please?