This problem hit my eyes since 24 version of firefox. I don't have the flash player installed. And the problem is not always reproducible, it's 1/3 I think. I can reproduce the problem in safe mode too, so it is not an addon issue.
top -H:
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
1883 username 102 0 1227M 619M CPU0 0 2:18 100.00% frefox{Media State}
Am I only one who experience this behaviour?
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