It doesn't work on every site, for example you can't stop the animations on Steam profiles which are annoying and they are regular gifs.

Doesn't work reliably anymore. Some animations get paused while others don't.

Switched to this after SuperStop ironically stopped working. Togglific works well with one caveat: Please add an option to disable the "Animation Paused!/Resumed!" notifications. I find them obtrusive and unnecessary.

Update: this extension doesn't seem to work on the macOS (Big Sur, MacBook Pro Retina, 13-inch, Mid 2014) version of Firefox 138.0.4. At least the button doesn't appear on the toolbar. I can't figure out how to make the button available.

Update 2: the keyboard shortcut works: Shift-Command-X but the button is missing.

Mozilla decided to prevent ending animated gifs from extensions in Firefox (96?) and well extension Superstop which I relied on stopped working and a review there mentioned this extension and it's the only one that can still stop this crap. Mozilla keeps doing bad design to make Firefox worse and worse (mostly to make the browser run slower and slower). Hopefully the developer keeps the extension working.

Animations stop immediately without the need of reloading the page.

Can the uppermost animations at this site be suppressed?

https://www.freepress.net/

Screen recording:

https://put.re/player/ffL8ur4M.mp4

Postscript, 2020-01-01:

https://togglific.io/ is not found, I sent an e-mail to the developer.