Manage preferences and add-ons
Make Firefox yours through customization settings and add-ons
Control audio or video playback with your keyboard
This page explains the technical documentation on how to control media in Firefox by using the Media Session API.
Add-on Badges
You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
Permission request messages for Firefox extensions
More information about each permission request you may encounter when installing an extension into Firefox.
Firefox options, preferences and settings
The Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Recommended Extensions program
Learn how extensions make the cut for the Recommended Extensions program and where they can be found.
Make Firefox your default browser
Make web links open in Firefox automatically by setting it as the default browser on your computer. This article explains how to do that.
Connection settings in Firefox
Your organization or Internet Service Provider may offer or require you to use a proxy to connect to the Internet. Learn more.
Firefox's performance settings
Firefox automatically uses settings that work best with your computer. You can always change these settings.
Personalized extension recommendations
Learn more about how Firefox occasionally recommends extensions you may find interesting and how to opt-out.
Manage local site storage settings
Learn about local storage, how to access storage settings, remove site data or set exceptions for websites to store data in Firefox.
Does Firefox share my location with websites?
Learn what information Firefox sends to web sites about your location and how to use and manage location-aware features of your browser.
How to set the home page
Load your favorite pages in one click. We'll show you how to set your home page or restore the default page.
Recommendations from Firefox
This article describes why and how extension recommendations are made, including how to turn off recommendations.
View PDF files in Firefox or choose another viewer
You can view PDF files in Firefox using the built-in viewer or with a third-party tool. Learn more.
Change your default search settings in Firefox
Learn how to change search settings in Firefox, such as your default search engine and whether or not search suggestions are displayed.
An extension changed my New Tab page
View and disable extensions or add-ons that change the new tab page.
Recovering important data from an old profile
If you need to create a new Firefox profile, find out how to recover your old Firefox data such as bookmarks, history and passwords.
Configuration Editor for Firefox
Learn about the Firefox about:config page and how to use the Configuration Editor to view, change, or reset advanced preference settings.
Cannot remove an add-on (extension or theme)
This article describes how to uninstall an extension or theme that can't be removed normally. This includes problematic toolbars and search bars.
Multi-Account Containers
Multi-Account Containers is a Firefox WebExtension that lets you separate your work and personal browsing.
How to change your default browser in Windows 10
Learn how to make Firefox your default browser in Windows 10.
Tips for assessing the safety of an extension
Here are a few tips for assessing the safety of a third party extension.
Use Firefox in another language
How to display Firefox in a different language.
Pop-up blocker settings, exceptions and troubleshooting
Learn what pop-up windows are and what settings Firefox has for blocking or allowing them.
Back up and restore information in Firefox profiles
Firefox stores your personal information and settings in a profile folder. Learn how to back up and restore this important data.
Share data with Mozilla to help improve Firefox
The Telemetry feature sends us performance and usage data to help measure how Firefox behaves in the real world and improve it. Learn more.
Configuring Networks to Disable DNS over HTTPS
At Mozilla, we believe that DNS over HTTPS (DoH) is a feature that everyone should use to enhance their privacy. Learn more.
Search with the Firefox address bar
Learn how the address bar makes it easy to search the Web, find bookmarks or pages you visited before, use search engines and more.
Lightbeam extension for Firefox is no longer supported
Mozilla ended official support of the Lightbeam extension in October 2019 and has no plans to resume maintenance of it in the future.
Change what Firefox does when you click on or download a file
This article will describe how Firefox handles downloads for different types of files and how you can change that behavior.
Hide or display content in New Tab
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.
Firefox Notes status
Learn more about the discontinuation of Firefox Notes on November 1, 2020.
Assign shortcuts to search engines
How to search faster with search shortcuts.
Add or remove a search engine in Firefox
This article explains how to add or remove the search engines that Firefox uses.
Adobe Flash protected mode in Firefox
If the Flash plugin is installed, this Adobe security feature is enabled by default for 32-bit versions of Firefox on Windows. Learn more.
Disable high contrast mode in Firefox
How to disable high contrast mode if it's causing problems on some web pages.
Choose display languages for multilingual web pages
How to choose your preferred languages for multilingual web pages.
Tab preferences and settings
This article explains the Firefox settings available for managing your tabs.
How do I restore my tabs from last time?
This article explains the different options you have for opening the tabs and windows you had open the last time you used Firefox.
Use the Firefox Sidebar to access bookmarks, history and synced tabs
The Firefox Sidebar feature lets you access your bookmarks, history and synced tabs conveniently at the click of a button.
Block and unblock websites with parental controls on Firefox
This article explains how to block websites or filter website content in Firefox that may be offensive or inappropriate for children.
How do I use the Firefox spell checker?
Firefox automatically checks your spelling as you type. Available options include adding dictionaries and removing words added by accident.
Change the program used to open email links
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.
Manage extension shortcuts in Firefox
Manage your add-on shortcuts through the Manage Preferences menu in about:addons.
Access hidden tabs in Firefox
Firefox lets you know when there are tabs hidden in the background so you can access them easily.
Firefox Better Web with Scroll
Firefox Better Web with Scroll is a service that improves your reading experience and protects your privacy while funding journalism.
How to use collections on addons.mozilla.org
How to create, edit, share, and delete a collection on addons.mozilla.org.
Reporting extensions and themes for abuse
Discover what constitutes inappropriate content or behavior in an extension or theme, and see how to report any abuse you find.
Restore previous session - Configure when Firefox shows your most recent tabs and windows
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.
Feed reader replacements for Firefox
Firefox's built-in support for web feeds and Live Bookmarks ended in December 2018 with version 64. Learn more and find alternatives.
Automatically fill in credit card data on Web forms
Manage credit card autofill settings in Firefox version 81 and above.
Task Manager - see what tabs or extensions are slowing down Firefox
Firefox's "about:performance" page shows you what tabs or add-ons are making Firefox slow.
Understanding the risks of installing self-hosted extensions
Learn about the risks of installing extensions from third-parties and how to assess the trustworthiness of the source.
Price Tracker is retiring
Mozilla is ending official support for Firefox Price Tracker on September 30, 2019.
Frequently asked questions - Firefox add-on technology is modernizing
Add-ons have undergone big changes in Firefox 57 and above. This article answers frequently asked questions about changes to extensions.
End of support for Adobe Flash
Like other browsers, Firefox is ending support for Adobe Flash. Learn about the details here.
Importing Safari data into Firefox
Enable Full Disk Access on macOS version 10.14 (Mojave) or higher, so that you can import data from your Safari browser into Firefox.
Changes affecting Adobe Flash on Firefox for Mac
How sandboxing affects Adobe Flash applets.
