I was having problems with the 6.1 beta for X (my bookmarks file mysteriously ballooned from 52K to 15M, with corresponding performance issues) and tried 0.95.

Very stable, but seemed slower than NS 6.1. However, I *really* liked the tabbed window feature.

When 6.2 came out I switched back. Now I'm missing the tabbed windows but everything else is hunky-dory.