They are mastodon-specific, but most fedi software has a similar feature. Or at least, all of the mainstream microblogging software does, as well as some of the image / video sharing platforms. I’m unsure about Lemmy and Kbin. Here are the equivalent settings for FireFish: https://beehaw.org/pictrs/image/791e1619-b353-4607-88a7-581b6d87037e.webp