no-transition
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SVG animations
SVG smil animations are still playing. Firefox has an image.animation_mode flag in the about:config that can be set from normal to none - maybe your addon could also make use on that? (might also affect gifs though, but maybe for some that's also desirable)
On the other hand, it's probably not possible to pause/continue these animations without page reload, and afaik with the flag we don't get the final state of the animations but they don't even start, so a custom solution might be required. Hm, hope it doesn't turn out to be too much work.
In general, your addon does a very good job disabling the animations already :)
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserSettings/imageAnimationBehavior
Yes but that still only gives us the choice between fully playing and stopping animations, fully playing and repeating them or not even starting at all. Perfect would be a way to skip directly to the last "frame" of the animation