Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

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.

Avatar for Username

Firefox Support

Popular Searches: Update Firefox Profiles Firefox Sync

Frequent Topics

Explore the knowledge base.

Troubleshooting icon

Troubleshooting

Basic browsing icon

Basic browsing

Install and update icon

Install and update

Sync and save icon

Sync and save

Customize settings and preferences icon

Customize settings and preferences

Protect your privacy icon

Protect your privacy

Firefox for families icon

Firefox for families

Install and manage add-ons icon

Install and manage add-ons

Back up your data icon

Back up your data

Featured Articles

Captive portal detection

Captive portal detection

Description of how Firefox detects captive portal networks.

Insecure connection password warning in Firefox

Insecure connection password warning in Firefox

Firefox issues an insecure password warning when a web page's login form is not secure and your information could be stolen.

Common Myths about Private Browsing

Common Myths about Private Browsing

Learn more about common misconceptions about Private Browsing in Firefox.

Firefox options, preferences and settings

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.

Illustration of community

Join Our Community

Grow and share your expertise with others. Answer questions and improve our knowledge base.

Learn More