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end script error message: Script:chrome//wrc/content/overlay.js:1149


I get an unresponsive script error message asking me if I would like to end script now.


Firefox freezes and I have to end the program in task manager. Please help!

Additional System Details

Sites Affected


Installed Plug-ins

  • Shockwave Flash 11.4 r402
  • Google Update
  • Nitro PDF Plug-in for Firefox and Chrome
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.0
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • np-mswmp
  • Yahoo! activeX Plug-in Bridge
  • Office Plugin for Netscape Navigator


  • User Agent: Mozilla/5.0 (Windows NT 6.0; rv:16.0) Gecko/20100101 Firefox/16.0

More Information

  • Top 10 Contributor
  • Moderator
2043 solutions 8891 answers

hello nix_22, hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not then probably an addon is interfering here... the wrc part of the error message might indicate that it's related to avast! WebRep

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Question owner

Hi madperson! I removed avast before I tried to start it in safe mode but the problem still persisted. Then tried to start it in safe mode and, hooray! my machine absolutely flies with no trouble at all!! So how do I now sort out the addon interference?? Thanks, you're a life saver!

  • Top 10 Contributor
  • Moderator
10752 solutions 96760 answers

The name "wrc" mentioned in the chrome URL is usually a hint to which extension is causing such an issue.
You didn't list the extensions, so madperson wasn't able to give more precise instructions.

If it does work in Firefox Safe-mode then disable all extensions (Tools > Add-ons > Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

Question owner

Thanks cor-el! Think I may have found the problem. Firefox had disabled my outdated version of Java. Busy installing update and then we see! Otherwise I will carry on the enabling one extension

at a time. We live and learn :)
  • Top 10 Contributor
  • Moderator
10752 solutions 96760 answers

You're welcome.

You may still need to check the extensions if the error returns.

Do you have any clue which extension (name probably starts with a 'W') is causing this hang?

(I've removed your duplicate reply)

Question owner

OK. I have 2 things that are disabled in Extensions: Browser Manager 2.3.759.138, due to it being known to cause instability and security issues AND IDM cc 7.3.5 which is incompatible with Firefox 16.0.2 . Could these be causing the hitches even if they have been disabled?

  • Top 10 Contributor
  • Moderator
10752 solutions 96760 answers

No, not when they are disabled.
Maybe you already did something else to get rid of that extension.

Browser Manager from PerformerSoft LLC (browsemngr.dll), possibly added via Babylon, has often been mentioned as the cause of problems, so it is best to remove it.