So, BTTV emotes no longer show up in the emote menu, and I cannot use tab to tab-complete them - nothing happens. The emotes still display and play if they are GIFs, and I can type them out manually and they will work. I've disabled all other firefox add-ons and it didn't help. Don't use malwarebytes either, which someone else said was an issue.
The only thing I can think that has changed is I performed the windows update last week, which is about when it stopped working. Maybe its something related to that.