IT DOES NOT COMPLETE THE BACKUP!!! Rated 1 out of 5 stars

Your addon does not work with FF6.0 and with recently installed FF7.0.
It never ends!! And even after 30 min waiting for the backup to finish, it still displays the ridiculous windows:
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Firefox Envirnoment Backup Extension
Version: 7.0.2
Backup type: Selective
FreeDownloadManagerplugin(1.3.4).xpi
This window will close when backup is complete.
Note: Firefox may be unresponsive during backup.
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Again, it seems stuck at this particular addon FreeDownloadManagerplugin(1.3.4).xpi and it never completes the backup process even after waiting more than 30 min!!!
The only addons saved when it starts the backup process are 3 addons (plus the one above that is not saved completely I assume).

This review is for a previous version of the add-on (7.0.2). 

Please use support forum

In particular, see http://www.customsoftwareconsult.com/phpBB2/viewtopic.php?f=5&t=1722

From reading your reviews of other add-ons, I can tell you are the type of user that thinks this is the place to ask about support issues. It is not. When you write a review, you are shown the following message:

"Please do not post bug reports in reviews. We do not make your email address available to add-on developers and they may need to contact you to help resolve your issue. See the support section to find out where to get assistance for this add-on.."

I think you will find that developers are generally very responsive to questions and/or problems when they are presented in the proper venue.