More information about each permission request you may encounter when installing an extension into Firefox.
Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Learn about the risks of installing extensions from third-parties and how to assess the trustworthiness of the source.
Your organization or Internet Service Provider may offer or require you to use a proxy to connect to the Internet. Learn more.
You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
Manage credit card autofill settings in Firefox version 81 and above.
Add Container tabs to Firefox with the Multi-Account Containers add-on, to separate your work and personal browsing.
Firefox automatically uses settings that work best with your computer. You can always change these settings.
Learn what information Firefox sends to web sites about your location and how to use and manage location-aware features of your browser.
Learn how extensions make the cut for the Recommended Extensions program and where they can be found.
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.
How to make web links open in Firefox automatically by setting it as the default browser on your computer.
Firefox automatically checks your spelling as you type. Available options include adding dictionaries and removing words added by accident.
Learn about local storage, how to access storage settings, remove site data or set exceptions for websites to store data in Firefox.
Learn how to change search settings in Firefox, such as your default search engine and whether or not search suggestions are displayed.
This article explains how to block websites or filter website content in Firefox that may be offensive or inappropriate for children.
Learn what pop-up windows are and what settings Firefox has for blocking or allowing them.
This article explains how to add or remove the search engines that Firefox uses.
Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.
Here are a few tips for assessing the safety of a third party extension.
Firefox lets you know when there are tabs hidden in the background so you can access them easily.
How to create, edit, share, and delete a collection on addons.mozilla.org.
Learn more about how Firefox occasionally recommends extensions you may find interesting and how to opt-out.
Learn how the address bar makes it easy to search the Web, find bookmarks or pages you visited before, use search engines and more.
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 describes how to uninstall an extension or theme that can't be removed normally. This includes problematic toolbars and search bars.
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.
Firefox stores your personal information and settings in a profile folder. Learn how to back up and restore this important data.
You can view PDF files in Firefox with the built-in viewer. You can also choose a different viewer or set Firefox to always ask. Learn more.
Learn how to change what page you see when you first start Firefox, click the home button or open a new window.
This article explains the different options you have for opening the tabs and windows you had open the last time you used 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.
Firefox warns when multiple tabs are closed, there is an option to disable this warning if not required
Firefox has a built-in PDF viewer. We'll show you how to disable it and use another PDF viewer, like Adobe Reader, instead.
The Firefox Sidebar feature lets you access your bookmarks, history and synced tabs conveniently at the click of a button.
How to display Firefox in a different language.
Learn how to show or hide content on your Firefox New Tab page, such as changing which sections to display or showing a blank new tab page.
Add-ons have undergone big changes in Firefox 57 and above. This article answers frequently asked questions about changes to extensions.
View and disable extensions or add-ons that change the new tab page or home page.
Discover what constitutes inappropriate content or behavior in an extension or theme, and see how to report any abuse you find.
Firefox's built-in support for web feeds and Live Bookmarks ended in December 2018 with version 64. Learn more and find alternatives.
This article describes why and how extension recommendations are made, including how to turn off recommendations.
How to search faster with search shortcuts.
How to choose your preferred languages for multilingual web pages.
How to disable high contrast mode if it's causing problems on some web pages.
Manage your add-on shortcuts through the Manage Preferences menu in about:addons.
At Mozilla, we believe that DNS over HTTPS (DoH) is a feature that everyone should use to enhance their privacy. Learn more.
Mozilla ended official support of the Lightbeam extension in October 2019 and has no plans to resume maintenance of it in the future.
Enable Full Disk Access on macOS version 10.14 (Mojave) or higher, so that you can import data from your Safari browser into Firefox.
This page explains the technical documentation on how to control media in Firefox by using the Media Session API.
Learn more about the discontinuation of Firefox Notes on November 1, 2020.
Like other browsers, Firefox has ended support for Adobe Flash. Learn about the details here.
Mozilla is ending official support for the Mozilla Voice Proxy Server and its related projects. Learn more about the retirement of server and extensions.