Rated 5 out of 5 stars
I installed PrefBar 6.0.1 for SeaMonkey 2.2 in all four profiles that I use, replacing PrefBar 5.1.1 (which was tweaked to enable it for SeaMonkey 2.2). Preliminary testing indicates it is working well. Existing buttons from PrefBar 5.1.1 -- including some that a custom created myself -- still work appropriately.
When restarting SeaMonkey (required as part of the installation), an enabled Internet connection was requested so that http://prefbar.tuxfamily.org/ could be accessed.