Firefox users who run Windows with the latest Microsoft .net Framework 3.5 SP1 installed may have noticed a message yesterday on browser startup that was informing them about the Windows Presentation Foundation plugin and the Microsoft .net Framework Assistant add-on.
Quite a few things puzzled many users about this: most were pretty sure that they did not install the add-on or plugin in first place which made it even more mysterious to them as it meant that some other program or someone else must have.
When they checked the plugins section in Firefox add-ons they also noticed that they could not uninstall the Windows Presentation Foundation plugin in Firefox. Only the option to disable it was provided but that is obviously not the same as removing it from the web browser.
Mozilla in the meantime has disabled the add-on using a global hotlist.
The following is a guide on how to remove the Windows Presentation Foundation plugin in the Firefox web browser for good.
If the plugin would not be blacklisted it would be possible to find out about its dll files by typing in about:plugins in the web browser address bar.
The dll NPWPF.dll is the the Windows Presentation Foundation plugin. Here are the steps to remove it from the Firefox web browser (and other Mozilla products) for good:
Open Firefox after the restart. The Windows Presentation Foundation plugin should not show up in the list of installed plugins anymore. There is a second step that may be necessary. There is also a Registry entry for the plugin. Do the following to remove the plugin from there as well:
This should get rid of the Windows Presentation Foundation plugin in Firefox for now.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.