Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

can not sync

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by cor-el

more options

I can not sync. I click sync but nothing happens. I have a old mac and a new one. I want to sync because I want to bring over the settings from the old mac to the new one. I click sync but absolutely nothing happens.

How do I Begin by saving my current settings on my old Mac to the sync function so I can bring them over to the new Mac?

How do I bring over the info from "sync" to the new Mac? None of this is working for me. I need help please. thanks

I can not sync. I click sync but nothing happens. I have a old mac and a new one. I want to sync because I want to bring over the settings from the old mac to the new one. I click sync but absolutely nothing happens. How do I Begin by saving my current settings on my old Mac to the sync function so I can bring them over to the new Mac? How do I bring over the info from "sync" to the new Mac? None of this is working for me. I need help please. thanks

All Replies (1)

more options

If Sync isn't working then you can possibly transfer the files directly via a removeable USB drive.

You can copy certain files with Firefox closed to the current profile folder to recover or transfer personal data.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.


  • bookmarks and history: places.sqlite
  • favicons: favicons.sqlite
  • bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder
  • cookies.sqlite for the Cookies
  • formhistory.sqlite for saved autocomplete Form Data
  • logins.json (passwords) and key4.db (58+) or key3.db (57 and older) (decryption key) for Passwords saved in the Password Manager
    if you only have key3.db then make sure to remove an existing key4.db
  • cert9.db (58+) or cert8.db (57 and older) for (intermediate) certificates stored in the Certificate Manager
    if you only have cert8.db then make sure to remove an existing cert9.db
  • persdict.dat for words you added to the spelling checker dictionary
  • permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences)
  • sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)