The vast majority of Chrome extensions work on Firefox. Up until Manifest V2 being deprecated, the reverse was true, too.

Yes but Chrome has many niche extensions that prevents me from migrating, I've tried since the manifest v2 news.

I don't mean "the same plugin published on extension stores", I mean "copy the extension files from Chrome to Firefox" compatibility. They're both WebEx standard, and the API compatibility between the two is huge. If there's a Chrome extension that you don't find published for Firefox, there is a solid chance the author just didn't bother publishing it on the Firefox Addons repo.