Wow, something certainly changed on the site. It seems that the code custom footer code I had is no longer compatible with the site. I'll fix that quick...
There. Version 2.27.1 is up on both Chrome Web store and Greasy Fork, so everyone should get automatic updates soon. This update fixes the new footer issue and removes a no-longer-needed style bugfix for activity feeds.
Sorry, it seems there's been a lot of messages here in the last couple of days that I've missed. I'm off to bed now, but I'll make sure to read all of them tomorrow.