This annoys me endlessly as I seem to often have my hand on control / cmd from working in the terminal.
Turns out it’s an easy fix in Firefox’s
mousewheel.with_control.action 0 mousewheel.with_meta.action 0
And if you use Firefox Sync and want those settings to sync between your devices also add:
services.sync.prefs.mousewheel.with_meta.action true services.sync.prefs.sync.mousewheel.with_control.action true