Learn how extensions make the cut for the Recommended Extensions program and where they can be found.
You can view PDF files in Firefox using the built-in viewer or with a third-party tool. Learn more.
More information about each permission request you may encounter when installing an extension into Firefox.
The Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Make web links open in Firefox automatically by setting it as the default browser on your computer. This article explains how to do that.
Your organization or Internet Service Provider may offer or require you to use a proxy to connect to the Internet. Learn more.
Firefox automatically uses settings that work best with your computer. You can always change these settings.
Learn more about how Firefox occasionally recommends extensions you may find interesting and how to opt-out.
Learn about local storage, how to access storage settings, remove site data or set exceptions for websites to store data in Firefox.
Load your favorite pages in one click. We'll show you how to set your home page or restore the default page.
This article describes why and how extension recommendations are made, including how to turn off recommendations.
Learn what information Firefox sends to web sites about your location and how to use and manage location-aware features of your browser.
Multi-Account Containers is a Firefox WebExtension that lets you separate your work and personal browsing.
Learn about the Firefox about:config page and how to use the Configuration Editor to view, change, or reset advanced preference settings.
View and disable extensions or add-ons that change the new tab page.
Learn how to change search settings in Firefox, such as your default search engine and whether or not search suggestions are displayed.
This article describes how to uninstall an extension or theme that can't be removed normally. This includes problematic toolbars and search bars.
Learn the different controls for the New Tab page on Firefox, including opening a blank page and choosing the page that opens in a new tab.
Learn how the address bar makes it easy to search the Web, find bookmarks or pages you visited before, use search engines and more.
Learn how to make Firefox your default browser in Windows 10.
Learn what pop-up windows are and what settings Firefox has for blocking or allowing them.
Here are a few tips for assessing the safety of a third party extension.
How to display Firefox in a different language.
Firefox stores your personal information and settings in a profile folder. Learn how to back up and restore this important data.
At Mozilla, we believe that DNS over HTTPS (DoH) is a feature that everyone should use to enhance their privacy. Learn more.
The Telemetry feature sends us performance and usage data to help measure how Firefox behaves in the real world and improve it. Learn more.
This article explains how to add or remove the search engines that Firefox uses.
If you need to create a new Firefox profile, find out how to recover your old Firefox data such as bookmarks, history and passwords.
This article will describe how Firefox handles downloads for different types of files and how you can change that behavior.
Mozilla ended official support of the Lightbeam extension in October 2019 and has no plans to resume maintenance of it in the future.
This article explains the different options you have for opening the tabs and windows you had open the last time you used Firefox.
The Firefox Sidebar feature lets you access your bookmarks, history and synced tabs conveniently at the click of a button.
This article explains how to block websites or filter website content in Firefox that may be offensive or inappropriate for children.
Firefox automatically checks your spelling as you type. Available options include adding dictionaries and removing words added by accident.
Learn how to change the email program that Firefox opens when you click a "mailto" link or use the "Email link" and "Email Image" features.
This article explains the Firefox settings available for managing your tabs.
Manage your add-on shortcuts through the Manage Preferences menu in about:addons.
How to disable high contrast mode if it's causing problems on some web pages.
How to choose your preferred languages for multilingual web pages.
Firefox lets you know when there are tabs hidden in the background so you can access them easily.
If the Flash plugin is installed, this Adobe security feature is enabled by default for 32-bit versions of Firefox on Windows. Learn more.
How to search faster with search shortcuts.
Learn about the risks of installing extensions from third-parties and how to assess the trustworthiness of the source.
How sandboxing affects Adobe Flash applets.
Mozilla is ending official support for Firefox Price Tracker on September 30, 2019.
Firefox's built-in support for web feeds and Live Bookmarks ended in December 2018 with version 64. Learn more and find alternatives.
Discover what constitutes inappropriate content or behavior in an extension or theme, and see how to report any abuse you find.
Add-ons have experienced big changes in Firefox 57+ (aka Firefox Quantum). Check out these frequently asked questions for more information.
Firefox can automatically restore windows and tabs that were open the last time you used it. Learn how to set up options for controlling it.
Firefox Better Web with Scroll is a service that improves your reading experience and protects your privacy while funding journalism.
How to create, edit, share, and delete a collection on addons.mozilla.org.
Firefox's "about:performance" page shows you what tabs or add-ons are making Firefox slow.
Learn how to enable and disable full disk access on macOS version 10.14 or higher, so that you import Safari browser data into Firefox.
Manage credit card autofill settings in Firefox version 81 and above.