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
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 xorg-video- intel
/var/log/Xorg.0.log
output of lspci -vvnn
output of apt-cache policy xserver-