Not useful as a final beta on Mac
I now see serious redraw problems both in the title bar / tab bar, and in the main window (these are new in beta 9, beta 8 was fine, this does not feel like a product should when it's approaching release, when such serious regressions are being introduced this late in the process!) …
Anyway, these redraw problems have made beta 9 unusable for me on Mac OS 10.6. https://bugzilla.mozilla.org/show_bug.cgi?id=623852 is probably the culprit, and is fixed in nightly builds … if it _isn't_ fixed, the if a bug this serious made it in to the RC, then that would be Very Bad. Fingers crossed that doesn't happen.
<rant>This caused me to try Opera for the first time in ages: absolutely useless to me. First thing I try to do is to import a client certificate from a p12. Not possible. Orphaned file dialogs, focus-stealing by bits of UI I'm not using at the moment, ends up not importing it once I've managed to get focus to the right "OK" buttons in the right order for the several layers of modality. The fact that it's unable even to perform this simple task, the first I tried, means I won't be trying it again any time soon. This is in a full release, 11.00, not a beta, by the way.</rant> Shame, Opera Mobile is very nice on Windows Mobile …
Back to Safari, which seems to (a) redraw correctly, and (b) be able to import and use my client certificate. And looking forward to beta 10!