Hi David & Jeremy, I am using an old Nexus 7 (2012 version) with a special Android version (Slim-4.4.4 since the Nexus became unusable with newer 'standard' Android versions). It uses Firefox v45.0.2. I searched for TiddlyFox and could install it by just clicking a button (I vaguely remember it was more difficult in the past as David wrote). The TiddlyFox add-on 1.0alpha18.1 is signed and works.
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