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

Sync encountered an error while syncing. Unknow error

  • 2 replies
  • 4 have this problem
  • 7 views
  • Last reply by hectop

more options

I keep on getting the following error message: "Sync encountered an error while syncing. Unknown error. Sync will automatically retry this action." Also, at this time, my bookmarks are useless: I lost all my bookmarks and I cannot add any new ones.

I keep on getting the following error message: "Sync encountered an error while syncing. Unknown error. Sync will automatically retry this action." Also, at this time, my bookmarks are useless: I lost all my bookmarks and I cannot add any new ones.

Chosen solution

Problems with bookmarks and history not working properly can be caused by a corrupted places.sqlite database file.

You can check for problems with the places.sqlite database file in the Firefox Profile Folder.

Read this answer in context 👍 1

All Replies (2)

more options

Chosen Solution

Problems with bookmarks and history not working properly can be caused by a corrupted places.sqlite database file.

You can check for problems with the places.sqlite database file in the Firefox Profile Folder.

more options

Your solution worked. Thank you for your help. It is greatly appreciated.