Imagus - The extension is intended to complement image features that (I think) is missing from Opera by...
Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
Image Max URL - Help find larger or original versions of images, including a customizable image popup feature
Pliim - One click and be ready to go up on stage and present!
Thumbnail Zoom Plus - The official site of the Thumbnail Zoom Plus add-on for Firefox
Hocus Focus - A Mac menu bar utility that hides your inactive windows