Hello,

I had same issue with Windows XP. This was due to Sync being installed twice I believe. Firefox 4.0 has Sync embedded. In my case I also had Sync installed as an extension (from Firefox 3.6).

Try to look for Sync in Add-ons manager and un-install it. Restart Firefox. Then you can select Sync tab in Options dialog box and there should be no parsing error any more.

Worked for me at least. Good luck

Must be something else, don't have sync installed, still having the parsing error. Will keep looking for a solution. Thanks

@Wy0Jim63

What is the chrome://.... file path that is shown in your error message?

You can try to reset the preferences.

• http://kb.mozillazine.org/Resetting_preferences
• http://kb.mozillazine.org/Preferences_not_saved