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

Hw do I fix this error "Script:resource://gre//modules/services-sync/engines/prefs.js:219?

  • 4 replies
  • 1 has this problem
  • 6 views
  • Last reply by ATBQuilts

more options

I have a Mac and I get this error when I m trying to adjust setting to print to a Dymo 450 turbo Labelwriter. Usually (but not always) when I click on the continue button it totally freezes everything and I have to force quit Firefox

I have a Mac and I get this error when I m trying to adjust setting to print to a Dymo 450 turbo Labelwriter. Usually (but not always) when I click on the continue button it totally freezes everything and I have to force quit Firefox

All Replies (4)

more options

Please update to version 20 to see if it has any difference. If no difference, try a reset.


The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

  1. Go to Firefox > Help > Troubleshooting Information.
  2. Click the "Reset Firefox" button.
  3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
  4. Firefox will open with all factory defaults applied.


Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

more options

Are you using Sync?

You can check for problems with preferences and try to rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default values.

more options

I am currently using Version 20. I tried the reset but the problem is still happening.  :(

more options

Yes, I am using Sync. I tried resetting the preferences and the unresponsive script error came up again, but this time with a different message.