Rated 5 out of 5 stars

Nice addon :-)

But the infos here are out of date.
Version 1.0.3 (TB 3.0.*) is already available: http://www.xzer.net/harvest/sendfilter/

And it seems that this functionality is going to be implemented into TB 3 soon:
https://bugzilla.mozilla.org/show_bug.cgi?id=11039#c63

This review is for a previous version of the add-on (1.0).