For me this page gives constant 50% CPU load and rising memory usage for
Firefox 3 release version under Windows XP x64 SP2:

http://www.theinquirer.net/gb/inquirer/news/2008/07/09/nvidia-g84-g86-bad

I have dual-core CPU and Windows scheduler seems to be bouncing the
thread around so that my whole system becomes unresponsible, not just
Firefox. On some pages I have observed Firefox process eating 700+ MB of
RAM (and increasing) when this high CPU load happens.

If I lock the process to one of the cores, then the system
responsiveness improves, but Firefox is still sluggish.

When I check with Process Explorer, the IP of a thread consuming CPU
time is inside js3250.dll address space or sometimes in xul.dll. When it
is inside of js3250.dll stack trace also includes xul.dll.

On one of the pages I have narrowed the problem down to the
feedburner.com -- if I block *.feedburner.com using adblock, and reload
the page the problem disappears.

I believe it is a JavaScript related bug.

-- 
Firefox eats way too many CPU cycles with certain pages
https://bugs.launchpad.net/bugs/16465
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