I recently upgraded to Firefox 2.0.3. Previously I had been using a 1.5.x version. After discovering Firefox frequently using 100% of the CPU after using it only for a short while, I investigated further. It apparently is makes tons of gettimeofday syscalls. I stumbled upon a known issue in bugzilla. Mozilla runs at ~100% cpu usage after connection is interrupted or wakeup from hibernate or standby. I thought it was some page I was visiting, but apparently not. Firefox 1.5 doesn’t have this issue on my hardware platform, a Dell Inspiron 1100 running Linux 2.6.20.6 with the latest release of suspend2. I have downgraded back to 1.5, which I was happy with anyway.
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