Rated 5 out of 5 stars

Thanks anon regarding the explanation of the packed .js file (it's a data file that can be restored to original state).

Regarding the issue of the license, at http://code.google.com/p/ghostery/ is mentions GPLv2. The problem is that the author should follow the guidance of GPL and
1. include 'COPYING' in the source code.
2. Mention GPL in each source file.

For more on this steps, see http://www.gnu.org/licenses/gpl.html

This may sound secretary work, but it's very important. Also allows to say: got a problem? fix and send over a patch :-). It's free software.

This review is for a previous version of the add-on (2.0.2).