[_bxg1]

The problem is most browsers don't have an easy way to add custom styles any more.

Desktop Safari does, surprisingly, and I use it there.

Firefox removed that feature.

There are extensions, but browser extensions are a massive security hole so I don't use any that aren't too-big-to-be-corrupted.

[accelbred]

Firefox didn't remove it. They just put it behind a new flag that is default off. Apparently it was because it affects performance for those not using the feature.