Force-enable font hinting, maybe
Revert "Force-enable font hinting, maybe"

This reverts commit 7d0f6255d739b7680b20b46476e549a36861b9e9.
Revert "Bug 1020778 - Reduce opacity of low-res buffer by half when compositing it to the screen. r="

This reverts commit f1b6c5bd16b0eef11258b9de987fead3418a8694.
Replace ClearSans with FiraSans