Rated 4 out of 5 stars
Brilliant add-on, very useful for image-heavy sites such as Reddit or Facebook. However, I would prefer it if you could extend the site options to include all compatible sites instead of the "Others" option (or at least allow users to manually blacklist websites).
Furthermore, I would prefer it if there was an option to remove the context menu entry "Save enlarged...". I have tried add-ons that allow you to edit Firefox's context menus to no avail - your option does not seem to be identified within the add-on "Menu Editor".
If it were not for those two inconveniences, this add-on would receive 5/5. However, 4/5 is what I shall award it. You have done a great job with this and I appreciate the fact that you are taking the time to address every review and actually considering everyone's feedback.
EDIT: Thank you for the reply! I appreciate the fact that you are looking to enable a black list. And I would be ever so grateful if you did decide to add an option to remove the context menu entry - but there's no obligation on your part. :-)
Menu Editor now works with TZP
I'm planning on a user-editable black-list in the future.
Starting with Thumbnail Zoom Plus 2.0 the "Save enlarged..." menu item can be hidden using the Menu Editor add-on. Please try it with the latest version of TZP and see if it works for you.