Xlib: Maximum number of clients reached -- firefox?

I'm rather happily running FC6 on my Thinkpad Z61t. I got even happier when I discovered that suspend works without a hitch, with no pre-suspend fiddling required. On resume, everything comes back up including my WPA-encrypted ipw3945 wireless connection, and this with my HDD in AHCI mode. All very, very shiny. So I haven't shut down or logged out in a week. Today, though I started getting errors like this upon trying to start new apps: Xlib: connection to ":0.0" refused by server Xlib: Maximum number of clients reached 'xrestop' takes an absurd amount of CPU time to run, but seems to indicate that firefox has a huge number of windows open (over 2500). I certainly don't have that many windows/taps actually open, but I also haven't shut down firefox in almost a week. Is this a firefox bug that needs reporting? If not, where should I be looking? Thanks. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University