Firefox tried to automatically upgrade me from to  However it would fail with this error:

One or more files could not be updated. Please make sure all other applications are closed and that you have permission to modify files, and then restart Firefox to try again.

Then when I’d press the OK button Firefox would again try to upgrade, fail and display the error.  It was an infinite loop and I was forced to use the Task Manager to kill Firefox.

I searched around and found an incredibly complicated solution in the blog article, Firefox error resolved: One or more files could not be updated.  Fortunately within the article it mentioned briefly that you could use the “delete the updates folder” approach.  Reading the comments of this article I was able to figure out what that meant.  Here are the steps I followed.

  1. Close Firefox.
  2. Go into your Firefox settings folder.  For me it is located in C:\Documents and Settings\fkim\Local Settings\Application Data\Mozilla\Firefox\Mozilla Firefox.
  3. Remove the updates folder.
  4. Restart Firefox.  It will download again the update and then when it tries to update it there won’t be a permission problem.

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