On desktop Hover Zoom is life changing way to browse memes and gifs. One thing I struggled with when I moved to Lemmy was Hover Zoom support. While it worked with imgur links, these are few and far between. I had given up hope when I finally discovered Imagus works perfectly.
My understanding is that it is that it has a list of sites it knows how to work with like reddit and imgur and for others it does not try to zoom. Images Ihosted on Lemmy fail to trigger the zoom.