Great, but one question Rated 5 out of 5 stars

How can one easily sort tab favorites alphabetically? I know you can move each favorite up/down, but if you have a lot of them..
Anyhow, if there is a way, I'll gladly pay for the pro version.

This review is for a previous version of the add-on (4.3). 

at the moment, the answer is no but you can drag tabs left <==> right.

you can drag tabs left <==> right directly on the toolbar. (No up / down necessary, that's an old dialog I really should remove)

another way to do this: you can delete them and add multiple items from the folder tree (which is sorted alphabetically) by highlighting them with SHIFT or CTRL. Also note that support (and requests for new features) is available here:

http://quickfolders.http://quickfolders.mozdev.org/bugs.htmlmozdev.org/bugs.html