These animated .png avatars have certainly become more obvious over the past few days since the Stake.com bounty campaign started paying anyone for any old spam
I've been using set "image.animation_mode" in Firefox to "once" for as long as I can remember, but the Stake avatars are still annoying. They animate too long for each round, and (combined with the massive spam it causes) that still creates long lists of animations on my screen.Animated avatars aren't supposed to be allowed, but I never got around to adding detection for the APNG ones. I'll look into it.
I'd love to see this fixed 