Windows Media Player Plugin for Mozilla

While developing and testing video/audio features for the PR project I found WMP caused Firefox to crash consistently upon closing (video/audio would play once, then any subsequent actions resulted in a browser crash).

Error (something to the extent of):

Windows Media Player Plug-in Dynamic Library

This plug-in has performed an illegal operation…

This did not occur in the previous PR release, so I’m guessing it may represents an incompatibility between WMP and more recent Firefox updates. I found this related technote ( which accurately described the problem I was having. I tested the plug-in and surprisingly it worked. I say surprisingly because the download site seems to be almost a year old. In addition, the new plug-in seems to be able to manage the configuration settings better than before. I’d like to suggest this plug-in be added to future updates for the rest of the department, but we may want to find out if others experience similar issues with WMP under the latest release of FF ( and/or what specifically is causing the crash. I have my theories, but with the new plug-in I may not be able to test them. I’d like to know if anyone else encounters this.

Plug-in Download site:

One thought on “Windows Media Player Plugin for Mozilla”

  1. While it seemed this plug-in resolved the error mentioned above, the error reappeared yesterday. I tried reinstalling the plug-in, but it did not have any effect. Additional testing determined the error occurred whenever I tried to over-write the player object html. It’s possible whatever mechanism the player uses to close/unload the object has a bug or is conflicting with something. I still don’t know the root cause of the problem, but a work-around is to clear the contents of the parent container using innerHTML or equivalent loading any new scripts.

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