A compiz update solve the bug. Thanks !
** Changed in: firefox (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1312452
Title:
Firefox 28 often freezes with grey screen under Ubuntu 14.04
Status in “firefox” package in Ubuntu:
Fix Released
Bug description:
Firefox package version 28.0+build2-0ubuntu2
Since update from Ubuntu 12.04 to Ubuntu 14.04, I have many freezes,
mostly under Thunderbird (I will open a bug too), but also under
Firefox. At present I have 5 Firefox windows opened with approximately
200 tabs.
My machine is a Dell Latitude E6520, with a Core i7 CPU, 8 GB RAM
(less than 4 GB used now). My HDD is a SSD (Samsung 830), htop says
CPU are quiet, iotop says there's no IO peak at all.
Everything was OK under Ubuntu 12.04.
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