Comment 6 for bug 1318403

My observation, it happens typically when i do something on google particularly gmail. I don't recall anything like that happening in calendar, docs or youtube. To my observation, no other sites in my experience have this (hang condition) problem.

At times, i can do a force quit. In that case, i usually logout & login again just to restart X. If it is a complete hang, & that happens periodically, at least 1ce a day, the power button does work for me, but you chaps are right, ctrl-alt whatever, not even f1-f4 work; so that i can at least do a clean shutdown. The system is completely hung. Here's my system info;
Acer aspire 4755g
intel core i5-2410M
NVIDIA GeForce 540M
Mem : 8gb

Firefox 33
Ubuntu 14.04.1
I followed this proc to install bublebee. Dono if i did something right/wrong, but at that time, it worked. I would say it started happening about 2wk to a month ago soon after i did an update.
http://coffeecup83.blogspot.sg/2013/04/ubuntu-1304-nvidia-optimus-bumblebee.html

personally, i'm not really sure it's a firefox problem since it only happens on google & in particualr gmail!