Firefoxchad here.
Just in case people are reading this from their phone (I was able to browse on the phone during the momentary downtime), everything the users said here is correct, Firefox still works just fine.
However, I would like to provide an even more surgical solution to this, in case you need to retain your cache for your workflow:
Right click on a Kiwi Farms URL from your History tab, then click "Forget about this site", with the option to clear the cache too.
Make sure you target all the domains you have used before (.net, .us, .st, .tw, .ru, or even sneed.today if you were around for that).
After this, just CTRL+F5, it will work like a charm, and you will not be forced to wipe your entire browser cache for something very minimal.