How to Fix Duplicate Shockwave Flash Player in Firefox


Mozilla Firefox is an open source Web browser. It is known for being very easy to customize with its ability to add extensions and plugins onto it. One of the most popular plugins is the Adobe Shockwave Flash plugin. This plugin allows users to be able to view and interact with flash files on their computer and on the Internet. Sometimes errors can occur if there are duplicate flash plugins installed. This is usually due to an Adobe DLM extension which must be removed.

Removing Adobe DLM

  • Open the Firefox Internet browser.

  • Click "Tools" in the upper left part of the window.

  • Click "Add-ons" and a new window will pop up.

  • Click the "Extensions" tab.

  • Find the extension titled "Adobe DLM."

  • Click "Uninstall."

  • Restart Firefox.

  • Install the Adobe Flash Player by downloading the software in the link located under "Resources."

  • Verify that there is only one Shockwave flash plugin by returning to the "Plugins" list under "Tools" > "Add-ons."

If There Are Still Duplicate Flash Players

  • Exit Firefox.

  • Find the Firefox plugin directory. This is normally located under "C:\Program Files\Mozilla Firefox\plugins".

  • Find the file named npswf32.dll and delete it.

If There is Still an Issue

  • Download the Adobe Uninstaller in the second link listed under "Resources."

  • Exit all applications.

  • Run the uninstaller and wait for the process to complete. Be sure to remove all Shockwave and flash applications.

  • Restart your computer.

  • Reinstall the Adobe Shockwave player using the file you downloaded in Section 1: Step 8.

Tips & Warnings

  • If you are still having issues, run an antivirus scanner as your computer may be infected with a virus.
  • These steps involve accessing and deleting .dll files. Deleting the wrong file could cause other issues with the Firefox browser.

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