I had 4 machines affected by this problem, 3x on Ubuntu 10.04 and 1 on 12.04, all with FF 13.0.1. It also seemed like Thunderbird was a problem, though not as bad as FF. Reboots "fixed" them all, but that's very disappointing. Ubuntu/ntp/GNU/Linux should handle time and leap-seconds more gracefully than this... :-( If I wanted to have time problems and have to reboot to fix things, I could run Windows.
I had 4 machines affected by this problem, 3x on Ubuntu 10.04 and 1 on 12.04, all with FF 13.0.1. It also seemed like Thunderbird was a problem, though not as bad as FF. Reboots "fixed" them all, but that's very disappointing. Ubuntu/ ntp/GNU/ Linux should handle time and leap-seconds more gracefully than this... :-( If I wanted to have time problems and have to reboot to fix things, I could run Windows.