If you just updated Xmarks and it tells you it’s unable to login, requiring you restart your browser, you probably did so and noted it didn’t help a bit.
This is probably due to a conflict with NoScript and is easily corrected.
- Disable NoScript by Allowing Scripts Globally.
- Sync Xmarks, logging in if it asks you to.
- Re-enable NoScript by Forbidding Scripts Globally.
Hope this helps!