Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

Flash Player Plugin disappearing from FireFox 11.0 - 4 times a day



I need to state first that I am using w2000 SP5. This is a clean install, with no male ware. I understand that the OS is not supported. But, my other computer has a defective motherboard and unable to replace it now.

I am using the last version of Firefox that was available for w2000, ( ver 11.0 )

I have modified Firefox NOT to UPDATE plugins. (Because new plugins don't; work in W2000.Firefox 11.0)

I have installed the last version of Flash that works in W2000 also. ( fp_10.1.102.64_and_9.0.289.0_archive )

All works as normal. No crashes. No issues.

Except, that the install magically disappears as a plugin from Firefox.

It disappears 3 or 4 times a day. Usually after I open Firefox a few hours later.

But, it is still in installed Programs list on computer.

I have been re-installing it every time, which is VERY annoying.

I have disabled Flash from automatic updates also.

There must be something that is checking to install a new version, and deleting my current install.

But, I can't find it.

I have tried many versions of flash, and all do the same thing.

So, I believe the problem is in Firefox.

I am posting my problem at Adobe also.

Please help me. TIA

Modified by DigitalDave_

Chosen solution

Firefox should find the Flash plugin via that registry key.

Try to create a plugins folder in the current Firefox profile folder and copy the NPSWF32.DLL file and the flashplayer.xpt file to that plugin folder.

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Open Containing Folder

Did you try to disable blocklisting and remove the existing blocklist.xml files in the Firefox application folder and the current Firefox profile folder?

Read this answer in context 1

Additional System Details

Installed Plug-ins

  • Shockwave Flash 10.1 r82
  • Next Generation Java Plug-in 1.6.0_27 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy


  • User Agent: Mozilla/5.0 (Windows NT 5.0; rv:11.0) Gecko/20100101 Firefox/11.0

More Information

Tried 4 different version of Flash. Al work Ok. No issues.
But, they all disappear as a plugin after a few hours

Rogerfds 0 solutions 2 answers

I think that my problem in new Java 7. I installed last 6 version and so far everything is fine.

Question owner

disregard.... I had a hard drive die yesterday, and thought my last backup had the fix.

I will need to re-apply.

Modified by DigitalDave_