Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Firefox 145 sign in to sync doesn't work

Denys replied
hulvius

Firefox was somehow reset after windows update restart. I was trying to sign in to sync, but sign in button gets blurred/disabled, and nothing happens then. I am afraid that I lost my previous session also.

I was trying troubleshooting mode too, but behavior is the same.

Otherwise I can login to my Firefox account web, and I am logged in on my smart phone still.

Firefox was somehow reset after windows update restart. I was trying to sign in to sync, but sign in button gets blurred/disabled, and nothing happens then. I am afraid that I lost my previous session also. I was trying troubleshooting mode too, but behavior is the same. Otherwise I can login to my Firefox account web, and I am logged in on my smart phone still.
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Hi,

Looks like you're dealing with a Mozilla account issue. We have a direct one-to-one support for Mozilla account (which is a different thing from peer to peer support forum like this one).

Please submit a new ticket from this page so our support agent can assist you further.