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Netflix Silverlight 2103 error after Firefox 3.6.15 upgrade, but IE remains fine, reinstall of Silverlight made no difference


Within the last week, Firefox automatically upgraded itself to v. 3.6.15. Netflix started reporting a Silverlight 2103 error. I followed the Netflix instructions to uninstall Silverlight, then let Netflix reinstall Silverlight, which it did according to the Netflix instructions. MSIE continues to be able to play Netflix instant-view movies, even after the uninstall/reinstall of Silverlight.

Did something break as of 3.6.15?

Netflix reports that this particular combo is not a known issue and they have opened a case based on my report. I wonder if other users are silently switching to a different browser without reporting it...?

Thanks for any ideas or solutions.

Additional System Details

Sites Affected


Installed Plug-ins

  • Office Plugin for Netscape Navigator
  • Adobe Shockwave for Director Netscape plug-in, version 11.0
  • ScorchPlugin
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Adobe PDF Plug-In For Firefox and Netscape "9.4.2"
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Default Plug-in
  • Shockwave Flash 10.2 r152
  • Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
  • 4.0.60129.0
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • Npdsplay dll


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20110303 Firefox/3.6.15 ( .NET CLR 3.5.30729)

More Information

Firefox 3.6.15 on Windows XP.
Nothing else on my laptop seems to be behaving differently. I don't have access to another XP box to test it, and trying it on one of our UNIX boxes is probably diagnostically meaningless since we know that even this Windows XP machine I'm on works okay under MSIE.

Question owner

P.S. I've now installed Chrome on my machine, and can confirm that the Silverlight problem is specific to Firefox. Chrome and MSIE both work fine.

Question owner

The Netflix supervisor I spoke to today finally confirmed that it is a known condition. But he said Netflix can't contact Mozilla, only Microsoft since Silverlight is Microsoft's product (even though it seems to be a Firefox change at issue, not Silverlight breakage).

The suggestion from Netflix is to switch to an earlier (and less secure) version of Firefox, or change browsers entirely to MSIE or Chrome. Please someone on the Firefox dev team check into this so Firefox doesn't lose market share to other browsers over this.

Question owner

Fixed under Firefox 3.6.16.