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Unlock Firefox

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Suddenly I cannot send email. I get a message: "Unlock Firefox". This seems to have occurred after the last update on both my tablet and cell phone. My PC functions properly. How do I unlock Firefox?

Suddenly I cannot send email. I get a message: "Unlock Firefox". This seems to have occurred after the last update on both my tablet and cell phone. My PC functions properly. How do I unlock Firefox?

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Is it Firefox itself that is locked, or something else?

Web search: https://www.bing.com/search?q=%2bUnlock+Firefox

What's your computer system and Firefox version?

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On mobile device you have the built-in app lock, so you need to check there whether Firefox is locked. This might be because now Firefox on mobile can be used as an auto-fill application for username and password.