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Firefox
Web browser for Windows, Mac and Linux
Firefox for Android
Web browser for Android smartphones and tablets
Firefox for iOS
Firefox for iPhone, iPad and iPod touch devices
Mozilla VPN
VPN for Windows, Mac, Linux, Android, and iOS devices
Firefox Relay
Service that lets you create email masks to hide your real email address
Mozilla Monitor
Find out if your private information has been exposed in a known data breach
Discover and save stories for later
MDN Plus
MDN Plus provides a custom user experience for MDN supporters
Firefox Focus
Automatic privacy browser and content blocker
Firefox for Enterprise
Firefox Quantum for businesses
Thunderbird
Email software for Windows, Mac and Linux
Thunderbird for Android
Email app for Android smartphones and tablets
Featured Articles
Update Firefox to prevent add-ons issues from root certificate expiration
Update to Firefox 128+ by March 14, 2025, to avoid issues with add-ons, DRM media and essential features due to an expiring root certificate.
Firefox options, preferences and settings
Settings panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Secure connection failed and Firefox did not connect
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
Website will not allow Firefox to display the page if another site has embedded it
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
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