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Every time I open Firefox it creates .wmv files on my desktop, how do I stop this?


It seems every time I open Firefox it creates .wmv files on my desktop. They have zero bytes and nothing in them. Error message in console: invalid drawable. This has been happening for the last couple of weeks at least.

This is driving me mad having to delete these all the time - what's causing this or what can I do to get rid of it?

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.5 r502
  • A plugin to detect whether the Adobe Extension Manager is installed on this machine.
  • Displays Java applet content, or a placeholder if Java is not installed.
  • iPhoto6
  • Microsoft Office for Mac SharePoint Browser Plug-in
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the QuickTime Web site.
  • Plugin that detects installed Citrix Online products (visit www.citrixonline.com).
  • Office Live Update v1.0
  • Musicnotes Viewer plugin 1.16.12 http://www.musicnotes.com


  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:18.0) Gecko/20100101 Firefox/18.0

More Information

frucade 0 solutions 20 answers

Sounds strange. Could be malware.

  • Try some virus checker
  • Try working with a new Profile. Therefore run firefox.exe on commandline as "firefox.exe -P --no-remote" to create and use a new profile. Don't forget to untick the "Dont ask next time" in that dialog.

Modified by frucade

  • Top 10 Contributor
  • Moderator
10780 solutions 97024 answers

Helpful Reply

@frucade: please check which Operating System the poster is using. In this case it is Mac, so directions for Windows do not apply.

Check the home page setting in case you have set a download page as one of the home pages.

You can try to delete some files in the Firefox Profile Folder like the downloads.sqlite file in case you have a pending download.

Try to delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox Profile Folder.

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).

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

  • Help > Troubleshooting Information > Profile Directory: Show Folder

Helpful Reply

Thanks Cor-el - I tried deleting those files to no avail, so went to the trouble-shooting area and it ended up being one of my add-ons causing it - video download manager. All sorted now, thanks for your help.

rlchism 0 solutions 5 answers

I had the problem too. Thanks. I disabled "Download Youtube Videos" and the problem went away. I don't think the program worked, anyway.