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

why does my antivirus block firefoxsetup.exe

  • 1 reply
  • 2 have this problem
  • 1 view
  • Last reply by philipp

more options

I have been trying to upgrade to Windows 10 and after installation, my adobe flash plugin crashes on every page! I updated mozilla and adobe flash and it still crashes..then I noticed in my antivirus that firefoxsetup.exe was blocked! I have no problems with Internet explorer, but truly prefer Firefox!

I have been trying to upgrade to Windows 10 and after installation, my adobe flash plugin crashes on every page! I updated mozilla and adobe flash and it still crashes..then I noticed in my antivirus that firefoxsetup.exe was blocked! I have no problems with Internet explorer, but truly prefer Firefox!

Chosen solution

hi, no original mozilla-built or provided setup file will have that name, so it is likely that you have downloaded some third-party adware-infected installer.

please always download software directly from its developers, and in the case of firefox only at its official location at www.mozilla.org/firefox !

How to install Firefox on Windows Troubleshoot Firefox issues caused by malware

Read this answer in context 👍 1

All Replies (1)

more options

Chosen Solution

hi, no original mozilla-built or provided setup file will have that name, so it is likely that you have downloaded some third-party adware-infected installer.

please always download software directly from its developers, and in the case of firefox only at its official location at www.mozilla.org/firefox !

How to install Firefox on Windows Troubleshoot Firefox issues caused by malware