Ok but heavy handed approach Rated 3 out of 5 stars

It works by completely removing all .gif images so they can't load but it also blocks useful non-animating type gifs on some sites, like dictionary sites (merriam-webster, tfd), that use gifs to show the audio icon or pronunciation key.

A better approach would be to load the gif images and then stop any gifs that are animating. Or offer it as a separate option. I know pressing the Esc key stops any animating gifs. Maybe you could have this addon automatically press the Esc key after the page is done loading or something.

This review is for a previous version of the add-on (1.0.1-signed.1-signed).