[dralley]

Try a profile refresh

[stouset]

Tried. No success. I've also fully-uninstalled it with CleanMyMac, also to no success.

[zaphirplane]

Why do you think a piece of software running on your laptop would behave differently from millions running on the same hardware. Profile, addon, custom install location, weird env variables

[jhatax]

have you changed the resolution of your display to be "scaled" in system preferences? does setting it to "default for display" make FF usable again?

[stouset]

I keep it at scaled to max resolution, but I reverted to default and it made no difference.