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how do I find my username? trying to put FF on my phone, cant login here. been using mozilla +10 years

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Had to setup new account

Had to setup new account

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For this forum, the username is at the top of the page between "Contributor Tools" and "Inbox".

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So it sounds like the real question is about a problem installing Firefox for Android... We generally recommend installing from Google Play. Is that not working for your device? If not, what device is it?