Wonderful Extension Rated 5 out of 5 stars

This is especially helpful for seeing what type of dimensions a small thumbnail will be once you get the full size version. Also helpful to size down some annoyingly large forum images / signatures.

One thing would make this extension superb, when zooming, it zooms in based on your mouse (Like Adobe Acrobat), rather than zooming in based on the Top Left Corner of the screen.

This review is for a previous version of the add-on (0.3.1).