- Is your Firefox scroll is jerky ?
- Are you seeing CPU spikes during scrolling ?
Try disabling pango !
Pango is part of Cairo graphics responsible for drawing internationalized text. Unfortunately in some cases pango consumes significant amount of CPU time when rendering text on web pages and this leads to jerky Firefox scrolling. To test whether pango is the cause open your terminal and issue following command.
Now execute firefox command to start Firefox. After this step if you see significant improvement in experience then execute following command otherwise look somewhere else to fix your problem.
echo "export MOZ_DISABLE_PANGO=1" >> ~/.bashrc