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Can't login firefox sync

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I can't login to firefox sync with correct account and password. I have tried to reset the password and it keep showing unexpected error, now, I even can't create a new account. Could someone tell me how to solve this problem? Thanks a lot.

I can't login to firefox sync with correct account and password. I have tried to reset the password and it keep showing unexpected error, now, I even can't create a new account. Could someone tell me how to solve this problem? Thanks a lot.
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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

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Question owner

Keep showing unexpected error....

Keep showing unexpected error....
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cor-el
  • Top 10 Contributor
  • Moderator
17273 solutions 156141 answers

In case of issues try to log in to the Firefox Account via this website.


In case of issues with Sync you can try this:

Disconnect from Sync and Reconnect to Sync again. You can disconnect from Sync by clicking the e-mail address in the "3-bar" Firefox menu button drop-down list or go to "Options/Preferences > Sync".

Delete the signedInUser.json file in the Firefox profile folder and delete the Weave folder (Sync was formerly named Weave) with Firefox closed.

Remove an existing chrome://FirefoxAccounts entry in the Firefox Password Manager.

If that isn't enough then delete the prefs.js files to reset all prefs and maybe also delete the compatibility.ini file to reinitialize the profile.

In case of issues try to log in to the Firefox Account via this website. *https://accounts.firefox.com/signin *https://accounts.firefox.com/settings ---- In case of issues with Sync you can try this: Disconnect from Sync and Reconnect to Sync again. You can disconnect from Sync by clicking the e-mail address in the "3-bar" Firefox menu button drop-down list or go to "Options/Preferences > Sync". Delete the signedInUser.json file in the Firefox profile folder and delete the Weave folder (Sync was formerly named Weave) with Firefox closed. Remove an existing chrome://FirefoxAccounts entry in the Firefox Password Manager. If that isn't enough then delete the prefs.js files to reset all prefs and maybe also delete the compatibility.ini file to reinitialize the profile.
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