You actually can edit your redirects in Firefox Mobile (at least it works in Nightly). There is a focus bug in the Edit Redirects popup.
Tap the Edit Reditects button. Nothing seems to happen, but then tap the back-arrow at the top. Go to your Firefox tab switcher, and you should now see a "REDIRECTOR" tab. This is the editor.
Yes! Back in the 1980s when long distance telephone was a thing, I used to dial (301) 737-2051 followed by a 5 digit pin to get access to a service that the let me enter a long distance call. It only took about 20-30 manual attempts for me to guess a valid 5 digit PIN! I'd just increment my guesses by 1 each time.
On my 2023 Subaru, the "Telematics" device is a small box behind the dash on top of the radio. I simply unplugged the GPS and Cellular cables attached to this device. Of course, now I can't use the OnStar-like emergency button anymore to call for help in an accident.
Tap the Edit Reditects button. Nothing seems to happen, but then tap the back-arrow at the top. Go to your Firefox tab switcher, and you should now see a "REDIRECTOR" tab. This is the editor.