Ngl, it's an pretty impressive extension to have if you're in search of comments beyond what a YouTube video provides as long as there's a reddit thread covering it.

Are you the author of Reddit Comments for YouTube (+ Nebula)?

Edit: I just tested your add-on. I have a few feature requests that could improve the experience:

An option to display Reddit threads in a list view. The one from the add-on i mentioned above is much better.

A setting to disable the large thumbnail image at the start of each thread.

The ability to continue into YouTube comments after scrolling through Reddit comments (i.e., combine both sections).

An option to limit the number of parent comments shown - for example, show only 10 Reddit comments before showing YouTube comments.