The worst part of youtube is the terrible comments so i use this extension to see reddit comments under youtube videos. It would be great to have a similar extension for Lemmy comments to appear on youtube videos.
https://addons.mozilla.org/en-US/firefox/addon/reddit-comments-for-youtube/
the extension would be even more interesting if it could work on any link on the web, allowing you to fetch lemmy threads with that url
It doesnt need to support the google api.
Gab (the nazi fediverse platform) had an extension like this a couple years ago https://github.com/gab-ai-inc/gab-dissenter-extension/
https://www.engadget.com/2019-03-01-gab-dissenter-comments-extension.html