Until the big changes land, you can have Firefox opt out of window scaling. Get info on the Firefox app and then check ”Open in Low Resolution” on the get info

Until the big changes land, you can have Firefox opt out of window scaling. Get info on the Firefox app and then check ”Open in Low Resolution” on the get info panel, then restart the app. You can pick up more energy savings by telling Firefox to stop using transparency. Go to about:config, and set gfx.compositor.glcontext.opaque to true.