This seems rather suitable for those musing on New Year and resolutions. No more GIFs, many of which still seem to get past GIF-blockers in the form of other formats.

How to hide all animated GIFs in Facebook comments:

This blocking option has been in the FBP Web browser addon since v.29.0 (May 2019), though it’s well-hidden. It’s found in the “Font, Colour & Design” section of the FBP options screen, where almost no-one would think to look for it.

1. Install FBP and re-start the Web browser. Visit Facebook, locate the icon at the top of the Facebook page that launches the FBP control panel.

2. Find and open the “Font, Colour & Design” section on the left-hand side.

3. Tick “Hide Animated Gifs”. Save settings, and exit the control panel.

4. Reload your Web browser and test on an especially annoying Facebook Group. A blank space should replace the animated GIF.

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Related: How to stop YouTube’s new animated ‘thumbnail previews’.

Update: October 2020: no longer working fully. I still see some animated GIFs in comments, despite having FBP working correctly.