Rated 5 out of 5 stars
After customizing the positioning of elements on TAB, I find the positioning is lost if I open a second FF window (lost for the new window only); don't know whether this is a TAB or FF issue.This review is for a previous version of the add-on (2.0.1-signed). This user has a previous review of this add-on.
Fixed in version 2.9
It looks like it is a Firefox bug, but it wasn't hard to work around in this case.