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!

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

Firefox won't open at all

  • 1 reply
  • 1 has this problem
  • 17 views
  • Last reply by crankygoat

more options

My Firefox won't open. A message written "Couldn't load XPCOM" pops up. What can I do?

My Firefox won't open. A message written "Couldn't load XPCOM" pops up. What can I do?

All Replies (1)

more options

Uninstall firefox and reinstall it.