<strikethrough> “Simple redirector extension” sounds like a good generic tool that should exist to sed urls in a similar way to how ublockO & AdNauseum can block more than one type of content based on simple rules. One extension could use one rule to use the old version of Reddit, another to replace YouTube with Invidious, Twitter with Nitter… oh wait! </strikethrough>

I knew https://addons.mozilla.org/en-US/firefox/addon/privacy-redir... could do the last two plus something for Instagram, searched https://duckduckgo.com/?q=nitter+invidious+instagram and lo and behold, https://www.oldd.it/r/privacy/comments/hpy82f/redirect_twitt....

I’d be surprised if HTTPS Everywhere wasn’t whitelisted. And if it isn’t, TIL you can use it to fix Reddit.

Oddly, while Firefox nightly did disable my extensions after the update, Firefox stable has continued to leave them enabled. They're not working perfectly, but they're all enabled. xStyle, tampermonkey, etc are all working for me. The only problem is that they're now impossible to disable, because that entire UI no longer exists (I've got some extensions that do unconditional page modification, which I had to uninstall completely)