Hello ashley354, Sync occurs with your account Firefox. In other words, your browser sends data that you have selected the server, and then, when you synchronize with another browser to your account, the data is returned. So no matter how many browsers you have, they will all be connected to the same account. Sync will happen to the last browser. I hope this answer helped you.

The main limitation is the size of the database, mainly numbers of bookmarks, and the changes made.

Please remember the Sync server must not be regarded as a backup. Consider making regular backups of bookmarks on at least one of your devices.

Sync is known to sometimes corrupt bookmarks libraries and that is not easy to recover from unless you have your own backups

• Restore bookmarks from backup or move them to another computer_manual-backup
• Firefox Sync troubleshooting and tips

  If you have more than 5,000 bookmarks in your Firefox profile, Firefox for Android won't sync them. Some limitations in Android and Sync itself make larger quantities of bookmarks unreliable, so this limit is there to protect your data.

I guess I phrased my question incorrectly. I have firefox on three different computers and haven't had an issue until recently. Now all the sudden my bookmarks are being tripled across each mozilla browser on each PC. I have uninstalled on two of the computers and logged back into sync and that has not fixed the issue.

You can check for problems with the places.sqlite database (bookmarks, history) in the Firefox profile folder.

• https://addons.mozilla.org/firefox/addon/places-maintenance/

See also:

• http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
• https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

If you use Sync then best is to disconnect Sync (temporarily) while performing maintenance/repair efforts to the places.sqlite database. You can change the password for the Sync account to reset data stored on the Sync server.

Try to disconnect all devices and only connect one device at the time after you have fixed the bookmarks on all devices.