Great Add-on, problem with Firefox 8 beta though Rated 4 out of 5 stars

I've been using Tab Mix Plus for months now, and just noticed that this latest Firefox update to v8 beta made the tabs lock in place (no longer able to slide them back and forth to re-order the tab bar). Is this a bug that won't be fixed until Tab Mix is updated or is there a setting that's causing the malfunction? If anyone can help me I'd appreciate it, I love using this add-on.

This review is for a previous version of the add-on (0.3.8.6.1-signed).  This user has other reviews of this add-on.

Try Tabmix dev-build at http://tmp.garyr.net/forum/viewtopic.php?f=3&t=10888

if you use Firefox betas it is always best to try our latest dev-build