> I'd be glad to learn of any other cool features and extensions that y'all might want to share.

I'm sure others will be sharing it as I type this comment as well, but for many HN readers, Multi-Account Containers [1] are bound to be a godsend. Easily log in to different accounts for any website, in different tabs. Great feature that's not available in other browsers.

[1] https://addons.mozilla.org/firefox/addon/multi-account-conta...

I can't imagine browsing the web without MAC and Temporary Containers. https://addons.mozilla.org/en-US/firefox/addon/temporary-con...

It's sort of like everything opens in a private browsing window, except the stuff I've whitelisted.

This lets you set regex/wildcard to contain subdomain or redirect happy sites into a single container