Comments on: Fixing a Firefox illegal operation

By: JW

JW — Tue, 13 May 2008 09:55:46 +0000

Thnx, removing “npmozax.dll” from the plugins folder did it for me. Got flash working again.

By: useful

useful — Mon, 30 Jul 2007 15:18:21 +0000

These are probably a little more advanced but it would be something I would try if downgrading to WMP10 doesn't work.

The Mozilla ActiveX plugin can cause this error. Removing the file "npmozax.dll" from the Firefox or Mozilla Suite installation directory plugins folder may stop the error.

Removing the files "GetFlash.exe" and "GetFlash.exe.manifest" from the Firefox or Mozilla Suite installation directory plugins folder and from the C:\WINDOWS\System32\Macromed\Flash folder may stop the errors.

The problem is often resolved by uninstalling Flash 8 or 9 and installing Flash 7.

This problem may be caused by a rootkit type virus.

By: useful

useful — Mon, 30 Jul 2007 15:07:52 +0000

Personally I downgraded from WMP11 to WMP10 out of frustration before I fixed the error by installing the plugin for firefox.

I would also check to see if the Digital Rights Managment plugin is installed correctly. In about:plugin there should be entries for

Microsoft® DRM
File name: npdrmv2.dll
DRM Netscape Network Object

and

Microsoft® DRM
File name: npwmsdrm.dll
DRM Store Netscape Plugin

If these are missing then the player plugin isn't installed correctly.

By: Justin

Justin — Thu, 26 Jul 2007 15:20:02 +0000

I’m getting the 2nd error you mentioned:
“Mozilla ActiveX control and plug-in support error
The plugin performed an illegal operation
Restart the broswer”

and downloaded the Windows Media Player plug-in and it did nothing for me. I still get the same error. Any other suggestions? Its driving me nuts. lol
Thanks
Justin