This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

my new version (70.01) will not sync with version 66.03 so I can't access my stored data.

more options

I just downloaded 70.01 on my macbook air, but it won't sync the data held on 66.03

I just downloaded 70.01 on my macbook air, but it won't sync the data held on 66.03

All Replies (3)

more options

Hi jayalison9, I'm sorry to hear about this problem.

Do you get a specific error message from Firefox that would help shed light on the cause of the problem?

Do you still have physical access to your installation of Firefox 66, or more specifically, to your profile folder containing your bookmarks, logins, and other data?

More info about the profile folder (hidden under Application Support):

more options

On Mac you may have Time Machine backups available that you can check.

  • ~/Library/Application Support/Firefox/Profiles/<profile>/

In Mac OS X v10.7 and later, the "~/Library" folder in the Home directory is a hidden folder.

more options

jayalison9 said

... but it won't sync the data held on 66.03

When Firefox connects to Sync (on both new and existing devices) it sends data to and receives data from the Sync server, there is no direct connection to other existing devices connected to the Sync account / Firefox Account.