Seems to be working fine! Now if you can even do the comments appear on the upper right corner (like the Sidesy add on makes it) that would be amazing.

Works great

doesn't do anything, I still see only Youtube comments

I was using a similar addon that started to trigger Reddit's rate limiting and wasn't being maintained. Karamel doesn't have the same issue and I haven't ran into rate limiting since I switched.

This seems to be better-implemented than the two most popular extensions of this type, and is fully compatible with my other extensions.

Glad to see this on Firefox! Wonderful add-on!