Rated 4 out of 5 stars
Good to have MouseZoom back. I had installed NoSquint to replace it but I hated those + and - buttons.
Before version 4 FF had always remembered my zoom levels with MouseZoom but that doesn't seem to be the case anymore with FF 4 and 5. Fortunately MouseZoom and NoSquint seem to work together seamlessly allowing me to take advantage of all the features of both. Now I can use the scroll wheel to zoom in and out and and each page always loads at the same zoom level I'd set the last time I viewed it.