Rated 5 out of 5 stars

YEAY! Yet another Undo Addon cluttering up my extensions list. Why have we forsaken about:config? FYI, centering totally breaks the internet. Not everyone uses full-screen view, some of us bring multiple windows open and overlap them just right to view multiple reference images. Now I have to size these windows, too, to get rid of the gray! GAH!

This review is for a previous version of the add-on (1.0.1-signed.1-signed).