Brilliant, some suggestions Rated 4 out of 5 stars

Seems to be lightweight, which I love, and does exactly what it says. Looks good without the white border but with the shadow (you have an option to remove border, which is great).

I appreciate the fact that you actually included hover tooltips to explain the "Pop-up takes keyboard focus" setting, but I wonder if you could do the same for "Scrolling triggers pop-up", though I do have an idea what it does.

Nice fact that you can enable/disable it for certain sites.

EDIT: Also, I was wondering whether you could add a screenshot on the add-on page of the fact that you can right-click on the link for an image and then press "Save Enlarged Image As..." in the context menu. I was not aware of this option (did not bother reading your notes, lol) until I happened to perform the right-click action. It would just improve awareness of this option to potential users.

EDIT 2: Also, in the future, would it be possible for you to add an option to position the image pop up anywhere you wish on the screen? For example, if I wanted the image to be positioned in the bottom-right hand corner of the screen at all times. Thanks.

Edit 3: Last edit, I swear! Can you include an option to remove the context menu option, since it is annoying when the context menu expands/shrinks all the time when you right click on an image. Thanks.

This review is for a previous version of the add-on (1.7.4.1-signed). 

Great suggestions, thanks!

I'll add a tooltip. You can also see a full description of the preferences in our Preferences help page http://thumbnailzoomplus.wordpress.com/manual/preferences/

I'll add a "Save Enlarged Image As..." screen shot.

Version 2.0.0beta3 fixes the expanding/shrinking menu problem by greying out instead of hiding the menu item when it's not available; it also keeps the menu item available for the last-hovered image, even when the image is no longer displayed. https://addons.mozilla.org/en-US/firefox/addon/thumbnail-zoom-plus/versions/

If you still want to remove the "Save enlarged image as..." menu item, you can do that using the "Menu Editor" add-on for Firefox.