Excellent Addon Rated 5 out of 5 stars

Great Addon. Simple to use.
Version 3.3.1 will now save image in png if chosen in Options. Firefox27.
Annotation is excellent with many tools.
Although it would be nice if you could save the Annotation line/border width in Options because the default of 10px is too thick.
Also, sometimes you want to display "Numbers near object" and sometimes you don't. So setting in Options makes it difficult to change back/forth.

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