Download Firefox Systems and Languages What's New Privacy Performance and connectivity Deal with error messages, crashing applications, connectivity issues, and slow performance. ទាំងអស់ All articles and threads Crashing and slow performance Site breakages Connectivity In English How to troubleshoot time related errors on secure websites Captive portal detection Connection settings in Firefox How to troubleshoot security error codes on secure websites Manage the devices linked to your Mozilla account What do the security warning codes mean? Firefox can't load websites but other browsers can Firefox DNS over HTTPS DNS over HTTPS (DoH) FAQs How to let Firefox use the internet on your Windows computer Resist Fingerprinting Browsing history in Firefox - View the websites you have visited Disable Firefox Sync Firefox blocked by macOS 15 Sequoia firewall - What you need to know Server Not Found - Troubleshoot connection problems HTTPS-First upgrades to secure connections How to resolve weak crypto error messages on Firefox Address screen sharing issues with Firefox on macOS 15 Sequoia Bug 1931078