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Can't Log in to Sync - "Something went wrong" Error (Firefox & Nightly)

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Hi everyone,

I'm having trouble logging in to Firefox Sync. I'm getting the error "Something went wrong. Please close this tab and try again." whenever I try to connect. This happens both in the stable release of Firefox and in Firefox Nightly.

I can log in to accounts.mozilla.com without any issues, so my password and account seem fine. The problem is specifically with syncing within the browser itself.

I've tried closing and reopening Firefox, restarting my computer, and even reinstalling both Firefox and Nightly, but the issue persists. I'm running Windows 11 and my Firefox version is 135.0.

Has anyone else encountered this problem? Any suggestions for troubleshooting steps I could take? I'd really appreciate any help as I rely heavily on syncing my data.

Hi everyone, I'm having trouble logging in to Firefox Sync. I'm getting the error "Something went wrong. Please close this tab and try again." whenever I try to connect. This happens both in the stable release of Firefox and in Firefox Nightly. I can log in to accounts.mozilla.com without any issues, so my password and account seem fine. The problem is specifically with syncing within the browser itself. I've tried closing and reopening Firefox, restarting my computer, and even reinstalling both Firefox and Nightly, but the issue persists. I'm running Windows 11 and my Firefox version is 135.0. Has anyone else encountered this problem? Any suggestions for troubleshooting steps I could take? I'd really appreciate any help as I rely heavily on syncing my data.