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

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.