The latest update (March 21st, 2025) essentially broke the add-on. Hovering over any picture on any website no longer shows the zoomed in image. The hotkeys do not work and neither does adding the websites to the whitelist. You're better off running an older version until this gets fixed.

New update broke the keyboard shortcuts

Hover Zoom+ used to work on many sites in Firefox. I mainly used it to preview Flickr images. But now (October 2024) it doesn't work at all anywhere. Just a heads-up, folks. This extension is broken.

Breaks XML document tree rendering.

Keeps crashing and it's a chore to get it working again...sadly it the only choice.

It's breaking Youtube thumbnails.

Does not work.