Hi, i can almost say that this is the same problem I have. I also run
Lenovo x230 and often experience 50 to 100% Firefox utilization
(currently Firefox 29, Ubuntu 14.04) on various tabs (i.e., is not
related to a specific site). I will post proper debug info/dump during
the spike as soon as it happens again. I have seen variants of this
since 12.04 at least and also on x201.
I have tested html5 video performance, and other problems areas, at
Mozilla where Firefox 27 to 31 has know bugs. However, in this case
video processes are not related, even considered that CPU spikes occur
in those cases as well.
Notable difference for me vs Colin is that Firefox sometimes hangs in a
weird way during this CPU spike. I can use the current Firefox window,
even open new tabs and surf etc. However, if i close Firefox during this
process with the CPU spike then the Firefox process is not killed, i
need to manually kill it. A plugin container process seem to also stay
open.
Any commands to get more debug info/dump in this situation is welcome?
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https://bugs.launchpad.net/bugs/1292911
Title:
firefox is pegging 2 CPUs at nearly 100%
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