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Re:Ask HN: Firefox Android users, is umatrix working now? by dngray on Thursday June 20, 2019 @06:34AM (#20231477)
I am sure you could have figured this out for yourself:

• May 5, 2019 https://www.mozilla.org/en-US/firefox/android/66.0.4/release...

• May 7, 2019 (further fix that was for the master password thing) https://www.mozilla.org/en-US/firefox/android/66.0.5/release...