This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I can't update Firefox due to "Cannot open output file" error.

  • 2 replies
  • 2 have this problem
  • 1 view
  • Last reply by FredMcD

more options

Whenever I try to run the Firefox installer, I get this error message saying "cannot open output file"

Whenever I try to run the Firefox installer, I get this error message saying "cannot open output file"

All Replies (2)

more options

What version are you trying to install and where did you get the file at?

more options

Some protection programs don't like the update/install stubs. Go here for the full installer.

http://www.mozilla.org/en-US/firefox/all/ Download Firefox For All Languages And Systems