FEBE Rated 5 out of 5 stars

Yes the new version works great. Sorry but I saw the other version after I wrote the first review

This review is for a previous version of the add-on (7.1.0). 

Rated 1 out of 5 stars

Works OK but does not backup every extension and no styles are backed up.

This review is for a previous version of the add-on (7.1.0). 

As mentioned in the "About this Add-on" section above, Firefox v20.0 needs FEBE v7.3.0 which is available from the FEBE homepage at http://softwarebychuck.com/febe/febe.html#latest.