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Starting Firefox writes a zero byte file to my desktop.


A few weeks ago I downloaded a file called Spanish Piece.wmv from a trusted source. It was a guitar instruction video. I have since deleted it. However, every time I start Firefox on my Windows 7 64-bit desktop, a zero-byte file named Spanish Piece.wmv gets written to my desktop. It will create a new one every time, and sometimes I have to go and delete a dozen or so of these files. Is there a batch file or startup file of some kind that this might have been written into? What do you suggest that I do to determine the cause of this problem? I would rather understand why it is happening rather than just make it go away by reinstalling and deleting all of my settings.

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.5 r502
  • Next Generation Java Plug-in 10.13.2 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Google Update
  • Adobe PDF Plug-In For Firefox and Netscape 11.0.01
  • GEPlugin
  • Coupons, Inc. Coupon Printer Plugin
  • Coupons, Inc. Coupon Printer DLL
  • np-mswmp


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0

More Information

I have tried deleting and reinstalling Firefox (while saving my preferences) but the problem was still there. I am using Firefox 18.0.1 on a Windows 7 Home Premium 64-bit eMachines desktop with a Pentium dual-core CPU and 4GB of RAM.

Question owner

FYI, I already deleted and reinstalled Firefox, but saved my preferences, but the problem was still there.

  • Top 10 Contributor
  • Moderator
10753 solutions 96760 answers

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 also try to delete the downloads.sqlite file in the profile folder.

Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

Tyler Downer
  • Administrator
  • Moderator
1165 solutions 6639 answers

Please update to Firefox 18.0.2 as well.

Question owner

I tried all those things, but now when I start up Firefox it writes five 0-byte files to my desktop, all bearing the names of old downloads.

Question owner

I am using Firefox 19.0.2 on a Widows 7 64 bit machine.

Helpful Reply

Problem solved. Another user had a similar issue. Disabling the Add-On "Download YouTube Videos" made the problem disappear.