We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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

When I open Firefox, a window pops up saying "Microsoft Visual C + + Runtime Library". What do i do?

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by cor-el

more options

When I open Firefox, a window with the title "Microsoft Visual C + + Runtime Library" pops up. Inside the window it has "Program:C:\Program files\Mozilla Firefox\firefox exe. R6034 An application has made an attempt to load the C runtime library incorrectly. Please contact the application's support team" What do i do?

When I open Firefox, a window with the title "Microsoft Visual C + + Runtime Library" pops up. Inside the window it has "Program:C:\Program files\Mozilla Firefox\firefox exe. R6034 An application has made an attempt to load the C runtime library incorrectly. Please contact the application's support team" What do i do?

All Replies (1)

more options

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See: