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I am using Firefox for android on Android 4.1.2, and I created a master password for passwords etc on Firefox, and promptly forgot it.

I think a way to solve this and start again is to remove the profile's directory (according to this, it is located at data/data/org.mozilla.firefox/files/mozilla/), but as I have not rooted this device, that is difficult.

I have also tried removing /storage/sdcard0/Android/data/org.mozilla.firefox, which did not work

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You should be able to go into Settings>Application Manager and clear data and cache for the Firefox application.

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    Thanks for the quick answer (so quick I can't mark it as answered :) – Wilf Aug 14 '14 at 17:51
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/data/data/org.mozilla.firefox/files/mozilla/ contains the profiles directories.

You would need root access and won't have to compensate with all of the data just to remove the master password. You would need an app with root explorer feature.

  1. Force-stop Firefox from Settings → Apps → Firefox.
  2. Go to your profile's .default directory and remove key*.db and signons.sqlite. * could be 3 or 4.

Start Firefox and the master password option would be found back to default state i.e. no password.

(Source)

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