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

Not Launching

Troubling shooting I have - Fission Windows -0/1 Disabled by default & Launcher Process -Disabled due to failure - I got Foxfire VPN - It didn't work well for me - When I deleted it I got an error message - msi file missing - reinstall Foxfire - I did but it will not launch (connect to the internet).

Troubling shooting I have - Fission Windows -0/1 Disabled by default & Launcher Process -Disabled due to failure - I got Foxfire VPN - It didn't work well for me - When I deleted it I got an error message - msi file missing - reinstall Foxfire - I did but it will not launch (connect to the internet).

All Replies (1)

Sorry to hear about this problem. Sometimes program installers and uninstallers mess with certain shared Microsoft files, triggering a message related to a missing VCRUNTIME140_1.DLL file. That can cripple Firefox.

If that was the file, or just to rule out that issue, you can (re)run Microsoft's installer for the VC Runtime files:

(A) Open https://docs.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist?view=msvc-160#visual-studio-2015-2017-2019-and-2022

(B) In the "Visual Studio 2015, 2017, 2019, and 2022" section of the article, download the installer for your system:

  • 64-bit Windows: the "X64" download
  • 32-bit Windows: the "X86" download

(C) Run that installer and restart Windows.

Any improvement?