Update: forum no longer allows new animated PNG avatars, existing ones still remain.
Ok, I've had it with the animated avatar ads... so if you're irritated like me and don't mind missing out on an occasional meme here's how you disable them in FireFox / Tor:
Open a new tab and enter about:config in the address field. Confirm the grave warning that shows up. Search for "animation" and change the value of image.animation_mode to "none" to disable all animations, or to "once" to let them play one time (
thanks to o_e_l_e_o for the tip).

Solution for Chrome:
For Google Chrome.
Animation Policy.
Author: Google Accessibility.
Run animations only once, or disable animation completely.
Disable image animation, or make animations run only once.
Works on all animated image formats and animated SVG. Does not affect video.
