I don't think that this is a Firefox issue since Gmail is a widely used website
and Google is the biggest sponsor of Mozilla.
Please attach the follow information:
/etc/X11/xorg.conf
/var/log/Xorg.0.log
output of lspci -vvnn
output of apt-cache policy xserver-xorg-video-intel
** This bug is no longer a duplicate of bug 177492
EXA is balls-achingly slow
** Changed in: xserver-xorg-video-intel (Ubuntu)
Sourcepackagename: firefox => xserver-xorg-video-intel
Status: New => Incomplete
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severe performance degration in Firefox 3
https://bugs.launchpad.net/bugs/206055
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