hello just wondering anyone has the same problem as me my cpu running high 100% when i use f/fox go to terminal comd top showing web-content using alot of cpu i disabled all my add ons did'nt work the same with most sites i go to.don't if this will help showing what card i have on my l/top Kernel modules: i2c_i801

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6730M/6770M/7690M XT] [1002:6740] (rev ff) (prog-if ff)
!!! Unknown header type 7f
Kernel driver in use: radeon
Kernel modules: radeon
thanks if you need more info let me know

Do you get this for every site you view in Firefox?

I've got GKrellm permanently docked at the right hand side of my right hand monitor so I can get an overview of my system loading; CPU, network, disk, etc.

Some sites I visit with Firefox can cause one of the cores to saturate, usually with some unwanted video advert or extraneous junk going on. Closing the tab usually returns it to normal.

Play Bonny!

Your video card probably has little to do with the problem. The situation you describe is usually caused by a script that wants to run, but firefox won't allow it.

so there is no way to really stop it from happening just exit whatever site i an looking at

I second what AwesomeMachine said.

When this happens, wait to see whether Firefox throws an "unresponsive script" error message. It can take what seems like forever (but is usually only a couple of minutes).

I saw the web-content issue (and 100% on one core) on Chrome with the google "don't auto-run HTML5" plugin. Removed the plugin, problem went away. I never run video in f/f, but it occasionally chews up CPU and RAM, so I just kill and restart it.
Probably a better answer out there, but satisfies my needs.