I'm using it with YouTube Anti Translate(I cannot add url, so replace spaces with dots: addons mozilla org/en-US/firefox/addon/youtube-anti-translate/) and ublock and it freezes me the youtube. I tried it on different browsers. If I disable any of these 3, youtube works again - still if I disable the Anti Translate I have the best results, because if I keep this one with any other I have high CPU usage but hopefully you can find the issue.

Mostly works as intended. Some videos are unaffected by the thumbnail change.
An option to remove emojis from video titles would be awesome

I love this, but it's not working on all videos on my home. ~1/20 are completely unaffected.

Works nicely. One suggestion - remove exclamation marks from titles.

It would be amazing if We could even choose on which channel to apply this "filter"

Does not work on all videos for some reason.

finally i can get rid of clickbait thumbnails/// lookin at you linustechtips. set it to middle of video and capitalize words!

I would really appreciate if you added an option to completely hide the video thumbnails (making them grey).

Works as intended! The results are quite welcome, seeing how bad clickbait can be on YouTube.

It would be great if it had a whitelist feature, the idea being that it won't change titles and thumbnails for whitelisted channels.

Overall, great extension, but I do have some features I'd love to see added:

The ability to change all-caps titles
Stretch the thumbnail image, so it fills out the entire box, not including black bars