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Unknown error when trying to set up Firefox Sync

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Unknown error when trying to set up Firefox Sync

I try to set up Firefox Sync but as I fill in my e-mail address on the first line i first get the message "invalide e-mail account" (or similar) but then when I continue to complete it with www@yyy.com it just says "unknown error". I have tried several different e-mail addresses on two different computers but the same annoying unknown error message keeps coming up. What am I supposed to do about that?

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Site Moderator

Re: Unknown error when trying to set up Firefox Sync

You can try to reset the sync prefs on the about:config page.


Try to create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

2 REPLIES
Legendary Contributor

Re: Unknown error when trying to set up Firefox Sync

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:


  1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
  2. Under "Time range to clear", select "Everything".
  3. Now, click the arrow next to Details to toggle the Details list active.
  4. From the details list, check Cache and Cookies and uncheck everything else.
  5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

Did this fix your problems? Please report back to us!

Site Moderator

Re: Unknown error when trying to set up Firefox Sync

You can try to reset the sync prefs on the about:config page.


Try to create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.