Description of problem:
while in gmail, firefox has difficulties scrolling up and down (with mouse scroll wheel) both in the main frame and in the left frame. chromium behaves flawlessly.

Version-Release number of selected component (if applicable):

# rpm -q firefox
firefox-12.0-1.fc17.i686


How reproducible:
always

Steps to Reproduce:
1.log into gmail account
2.(try to) scroll left frame or the main page in firefox or in chromium
3.
  
Actual results:
in chromium works as expected, in firefox takes a while until something happens

Expected results:
both should work

Additional info:
same latency can be seen in firefox if clicking on user menu ("cornel panceac" in my case) and again works fine in chromium.

this bug appeared after replacing the (newer) pci express video card (and the dead motherboard) with another motherboard and an older fx 5200 nvidia agp graphics card, that, unlike the pci-e card, does not support 3d with nouveau.

imho there may be two problems here: firefox maybe uses in ti's javascript engine some 3d graphics functions on scrolling up/down etc (although it seems they are not required, as chromium behaviour suggests) or maybe google knows something about gmail javascript requirements that mozille does not know.

but these are just guessing :)