phgrounds said

i want to overwrite the server bookmarks and then sync the ones on my computer as old bookmarks deleted are still on the server backup

Please Reset:

Click the menu button New Fx Menu , click help Help-29 and select Troubleshooting Information. The Troubleshooting Information tab will open. Under the Application Basics section, click on Show Folder. A window with your profile files will open. Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.

Click the menu button New Fx Menu and then click Exit Close 29 . Locate and delete the file prefs.js (or rename it, for example, to prefs.jsOLD, to keep the old file as a backup). If you find more than one, a prefs.js.moztmp file or a user.js file, delete (or rename) these as well. You can close the profile folder and open Firefox now.

fixed the 4 spaces ident lines that were forcing the horizontal scroll bar to appear

Easiest to clear the bookmarks and other data that are currently on the Sync server is to change the password of the Sync account.