This #accessibility bug (option to block animated favicons) is 24 years old and not fixed.
Thanks, #mozilla, for caring for #neurodivergent users (I'd always assumed this affects everyone to some extent, but come to understand that it doesn't)
@quincy I've been lucky not to notice any sites I use having animated favicons, which would bother me as well. What I have done is set layout.frame_rate to 3 (frames per second) in most of my Firefox profiles, and 6 fps for amateur videos. I only use the default frame rate for watching professional videos.
If you have a fediverse account, you can quote this note from your own instance. Search https://ohai.social/users/ChasMusic/statuses/115122201059244190 on your instance and quote it. (Note that quoting is not supported in Mastodon.)