This way, they can sell the data on and still stick to their 'privacy policy':
"Our Abine browser add-on uses hashes of unique identifiers that are not tied to you or your IP address, to help you track versions and updates for the add-on, and a different set of randomly generated identifiers to validate service requests such as creating or updating disposable email addresses. If you chose to provide more data in order to take advantage of additional services, such as webmail, add-on identifiers are never used in a way that ties it to your name or personal information to the best of our ability."
Also, Eric Jung is on their 'Advisory board':
http://abine.com/team.php
If you don't know who he is, he is a board member of Mozilla Add-Ons governing board. This 'update' has made a mockery of the update mechanism in Firefox and severely undermines it in my view. Here's a link to the support board over at Abine, where I have been voicing my disapproval and I recommend you do the same:
https://www.getabine.com/phpBB3/viewtopic.php?f=4&t=7&start=10#p37