Installation and updates

Windows 10 warns me to use a "Microsoft-verified" app

Windows 10 may interrupt your Firefox install with a warning about "Microsoft-verified apps". Firefox is safe to install and use, so choose "install anyway".

Thunderbird and Junk / Spam Messages

This article explains how Thunderbird's adaptive filter learns to identify junk mail ("spam").

Install Firefox on Linux

This article describes how to download and install Firefox on Linux.

How to install Firefox on Windows

This article describes how to download and install Firefox on Windows.

Update Firefox to the latest release

Firefox automatically updates itself by default, but you can always do a manual update. Learn how to update Firefox on Windows, Mac, or Linux.

Moving Thunderbird Data to a New Computer

How to move Thunderbird data (accounts, messages, passwords) to a new computer.

Profiles - Where Firefox stores your bookmarks, passwords and other user data

Firefox stores your personal information and settings in a profile folder. Find out what is in your profile and how to locate it.

Update to the latest version of Firefox for Android

This article shows you how to update to the latest version of Firefox for Android, so you can use all the newest features.

How to download and install Firefox on Mac

This article explains how to download and install Firefox on macOS.

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.

Firefox users on Windows 7, 8 and 8.1 moving to Extended Support Release

Firefox version 115 ESR will be the last supported release for Windows 7, 8 and 8.1.

Profiles - Where Thunderbird stores your messages and other user data

Thunderbird saves personal information such as messages, passwords and user preferences in a set of files called a "profile".

Import settings and data into Thunderbird

With Thunderbird's import tool, you can import settings and data from a variety of sources including Thunderbird profiles, other applications or files.

Deploy Firefox with MSI installers

Firefox Enterprise offers MSI installers to help system administrators customize and deploy Firefox in their environments.

Thunderbird and Gmail

Thunderbird can be set up to work seamlessly with Google's Gmail. Messages will be synchronized between your local version of Thunderbird and web-based Gmail.

Choosing a Firefox update channel

How to choose between rapid release and extended support release (ESR).

Download Firefox on Windows from the Microsoft Store

The "Mozilla Firefox" app is available from the Microsoft Store for Windows 10 and Windows 11. Learn how to install it.

Export your Thunderbird Profile

Thunderbird's export tool lets you create a backup of your Thunderbird profile including accounts, messages, address books, and settings.

Find what version of Firefox you are using

Learn how to find out what Firefox version you are using, to help troubleshoot a problem or just to know if Firefox is up to date.

Installing Thunderbird on Linux

This article will show you how to install Thunderbird on Linux.

Custom installation of Firefox on Windows

The custom setup option in the Firefox full, offline installer lets you choose the program folder location and shortcuts. Learn more.

Uninstall Firefox from your computer

This article describes how to uninstall the Firefox application from your computer and also how to remove the personal information that Firefox stores.

Profile Manager - Create and remove Thunderbird profiles

Thunderbird stores your personal information and settings in a profile folder. Learn to work with different profiles on Thunderbird.

Run Firefox on ChromeOS

This page explains how to install Firefox on Chromebooks and other devices running ChromeOS.

Firefox has ended support for Windows XP and Vista

Firefox version 52.9.0 ESR was the last supported release for Windows XP and Windows Vista. No further security updates will be provided for those systems.

I found a fake Firefox update

What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.

Import settings and data into Thunderbird for Android

How to import email settings from K-9 and Thunderbird for Android

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.

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.

Install Firefox on your phone or tablet

Firefox is available on iOS and Android devices. Learn how to install it on your phone or tablet.

Switching to Thunderbird

This article explains how you can switch to Thunderbird from your current mail application, such as Windows Mail, Outlook or also Mail on Mac OS and Evolution on Linux.

Automatic Conversion of Google mail accounts to OAuth 2.0 Authentication

Thunderbird 91.8.0, released 5th April 2022, converts Gmail accounts to OAuth 2.0 in compliance with Google's schedule for requiring this login method.

Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release

Firefox version 115 ESR will be the last supported release for macOS 10.12, 10.13 and 10.14

Installing an Add-on in Thunderbird

Add-ons add functionality to Thunderbird or change its appearance. Learn how to install add-ons to Thunderbird.

Set Firefox as your default browser from the notification panel on Android

Set Firefox as your default browser from the notifications drawer.

Profile Manager - Create, remove or switch Firefox profiles

Firefox stores your personal information and settings in a profile folder. Learn to work with different profiles on Firefox.

Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release

Firefox 78 was the last supported version for Mac OS X 10.9, 10.10 and 10.11. Users were moved to Firefox Extended Support Release (ESR).

Install Firefox on an Android device using Google Play

This article shows you how to download and install Firefox for Android on your Android device.

IMAP Synchronization

IMAP stands for the Internet Message Access Protocol. It enables a mail client (such as Thunderbird) to access messages stored on a mail server. It is more modern and fully featured than POP (Post Office Protocol), which is the other major protocol for accessing mail messages. Most email providers now support IMAP. To see whether your account uses IMAP or POP, check the Server Settings page in the Account Settings.

Installing Thunderbird on Windows

This article describes how to install Thunderbird on Windows.

Which version of Firefox am I using?

Find out what version of Firefox you're using on your iPad, iPhone or iPod.

Best practices for installing and updating Firefox

Disable automatic updates through the DisableAppUpdate policy, and get Firefox beta builds to test features in your environment before deployment.

End of support for Firefox Lockwise

Mozilla ended support for the Firefox Lockwise app on Android and iOS, effective December 13, 2021, and integrated its functionality into Firefox mobile.

Thunderbird for Android 8 FAQ

Frequently asked Questions for Thunderbird for Android version 8

Installing Thunderbird on Mac

This article describes how to install Thunderbird on Mac OS.

Switch from POP to IMAP account

This article explains how to switch from a POP to an IMAP account in Thunderbird.

Display the Thunderbird menus and toolbar

The menu items File, Edit, View, etc. are located in the menu bar. This article will help you restore a missing menu bar.

Install Firefox on your iPad, iPhone or iPod

Learn how to install Firefox on your iPhone, iPad and iPod running iOS 15.0 and up.

Recover user data missing after Firefox update

If your bookmarks, passwords, preference settings and other data are missing, it may be available in another Firefox profile. Learn more.

Getting started with Thunderbird

Getting started with Thunderbird for webmail users

New in Thunderbird for Android version 8

Introduction to the most interesting new features, improvements, and changes visible to users in Thunderbird for Android version 8.

What is the Mozilla Maintenance Service?

Firefox and Thunderbird install Mozilla Maintenance Service to allow seamless background updates. Learn how it works and how to disable or remove it.

Deploying Firefox on MacOS using PKG and Jamf

Learn how to deploy Firefox on macOS using pkg and Jamf

How do I choose my server on Mozilla VPN?

How to choose from servers in 30+ countries on your Windows, macOS, Linux, Android or iOS device.

Importing Safari data into Firefox

Import data from your Safari browser into Firefox. You must enable Full Disk Access on macOS version 10.14 (Mojave).

How to sign in to Mozilla VPN

Learn the steps to log in to Mozilla VPN on your computer or mobile device.

Upgrading from an older version of Thunderbird

This article will help you upgrade old versions of Thunderbird to the latest version.

Find what version of Thunderbird you are using

Learn how to find out what Thunderbird version you are using, to help troubleshoot a problem or just to know if Thunderbird is up to date.

Getting started with Firefox Lockwise

Use Firefox Lockwise to sync passwords saved in Firefox with your app logins on Android or iOS.

Solutions for "Can not create temp folder archive" error when installing Firefox (Windows 10)

Stuck with the "Can not create temp folder archive" error on 7-Zip when installing Firefox for Windows 10? This article will help you to solve the issue.

How to enable Always-on VPN on Android

Enable “Always-on VPN” on Android to encrypt your connection automatically every time you browse the Internet on your phone.

Automatically launch Mozilla VPN when your device starts

Follow the steps in this article to automatically launch Mozilla VPN every time you start your device.

How to download and install Mozilla VPN on iOS

Download and install Mozilla VPN to connect to the internet through one of our secure servers, keeping your location and online activity private.

Thunderbird Software Update Failed

This article presents possible solutions to this problem and workarounds to get Thunderbird updated.

How do I tell if I have the 32-bit or 64-bit Firefox?

Not sure whether you're running 32-bit or 64-bit Firefox on your Windows or Linux computer? This article explains how to find out.

Thunderbird support has ended for Mac OS X 10.6, 10.7 and 10.8

Thunderbird version 52 and above are no longer supported on Mac OS X 10.6, 10.7 and 10.8. Learn more about your options.

Deploying Firefox Customizations on macOS

How to run customizations on Mac.

Windows in S mode won't let me install Firefox

You cannot install Firefox from Mozilla or from the Microsoft Store on Windows in S mode. You must first switch out of S mode. Learn more.

How to download Mozilla VPN on your desktop or mobile device

How to download and install Mozilla VPN on your desktop or mobile device.

How to install Mozilla VPN on a Linux computer

Download and install Mozilla VPN to connect to the internet through one of our secure servers, keeping your location and online activity private.

Enable background updates on Firefox for Windows when Firefox is not running

On Windows, you can set Firefox to update in the background even when it isn't running, so you always have the latest version. Learn more.

Custom installation of Thunderbird on Windows

The custom setup option in the Thunderbird full, offline installer lets you choose the Windows program folder location and shortcuts. Learn more.

How to download and install Mozilla VPN on Windows

Download and install Mozilla VPN to connect to the internet through one of our secure servers, keeping your location and online activity private.

New in Thunderbird 115 Supernova

Detailed introduction to the most interesting new features, improvements, and changes visible to users in Thunderbird 115.0 Supernova.

Verifying a Mozilla Thunderbird installation package

This article explains how to verify a Thunderbird installation package that was downloaded from thunderbird.net or archive.mozilla.org

Install an older version of Firefox

Downgrading to a previous Firefox version doesn't solve most problems. This article links to older versions and provides some alternatives.

Download and install Firefox for Android

Use these articles to determine if you can download and install Firefox on your mobile device.

Is Firefox available for iPhone or iPad in my language?

Firefox is available on iPhone, iPad and iPod touch devices in some countries, with more on the way.

How do I move my Thunderbird data to a new computer?

Installing Ubuntu on Ubuntu Linux

Moving Thunderbird Data to a New Computer Redirect 1

Installing Thunderbird on Ubuntu Linux

Uninstall Firefox for Android

Learn how to uninstall/remove Firefox for Android from your device.

Uninstall Firefox for iOS

If Firefox isn't for you, uninstalling it from your iOS device only takes a few seconds.

Firefox is no longer available for download in the T-Store

Firefox for Android is no longer available for download in the T-Store in South Korea. You can still download it and receive updates from Google Play.

How can I get the latest version of Thunderbird on Windows XP or Vista?

How to update to the latest version of Thunderbird on Windows XP and Vista.

Your hardware is no longer supported by Thunderbird

On computers with processors older than Pentium 4, Thunderbird is no longer supported as of version 52.

64-bit Firefox crashes with Citrix's XenApp VM

The API hooks from Citrix XenApp 7.13 VDA do not work with 64-bit Firefox. How to find a workaround.

Repackaging the Windows Installer

Sometimes you might need to include changes you've made to Firefox in a new installer. This document shows how to do that.

Deploying Firefox with extensions

Deploy Firefox in your environment with preinstalled add-ons.

Choosing a Firefox CPU architecture for Windows OS

On both ESR and rapid release channels we offer Firefox builds for both 32 and 64 bit CPU architecture.

Thunderbird Beta

Test new features and fixes in the most stable pre-release build of Thunderbird.

Deploying Firefox on Windows

How to deploy Firefox for Enterprise on Windows devices.

Setting Up Roaming Users Profiles

Learn how to set up a roaming user profile on Firefox Enterprise.

How to silently install/uninstall Firefox for Enterprise

Learn how to silently install and uninstall Firefox.

Install Firefox Lockwise on iOS

Firefox Lockwise lets you access your synced logins so you can sign in to apps and websites across devices.

Install Firefox Lockwise on Android

Firefox Lockwise lets you access your synced logins so you can sign in to apps and websites across devices.

Firefox Lockwise - sync saved logins across Firefox and mobile apps

REDIRECT

How to add devices to your Mozilla VPN subscription

A subscription to Mozilla VPN lets you install the application on up to five devices. Learn how to add and remove devices after installing the app.

Dedicated profile per Thunderbird installation

Different Thunderbird installations need separate profiles. Learn more.

Managing Thunderbird Updates

Learn about automatic updates for Thunderbird deployments and how to ensure that the latest security patches are applied and all features are available.

Recover user data missing after Thunderbird update

If your messages, addresses, passwords, preference settings and other data are missing, it may be available in another Thunderbird profile. Learn more.

Firefox for Android (68 and earlier) end of support

Old versions of Firefox for Android will no longer receive security and performance updates. Please get the latest version of Firefox for Android.

Deploying Firefox with Language Packs

Deploy Firefox in your environment with preinstalled language packs.

What to do after you have subscribed to Mozilla VPN

Learn what to do after you have paid for a Mozilla VPN subscription.

How to sign up for Mozilla VPN

Follow the steps in this article to sign up for Mozilla VPN on your desktop computer or mobile device.

New in Thunderbird 102

Detailed introduction to the most interesting new features, improvements, and changes visible to users in Thunderbird 102.0.

How to download and install Mozilla VPN on Android

Download and install Mozilla VPN to connect to the internet through one of our secure servers, keeping your location and online activity private.

How to download and install Mozilla VPN on macOS

Download and install Mozilla VPN to connect to the internet through one of our secure servers, keeping your location and online activity private.

Well known sources for downloading the Thunderbird email software

This page lists the recommended ways to obtain Mozilla Thunderbird.

New in Thunderbird 128 Nebula

Detailed introduction to the most interesting new features, improvements, and changes visible to users in Thunderbird 128.0 Nebula.

Resolve “The installation seems to be incomplete/corrupt” error in Firefox on Windows

Fix the “installation incomplete/corrupt” error in Firefox on Windows by addressing common causes like corrupted files or hardware issues.

Will Firefox work on my mobile device?

This article lists mobile devices that you can install Firefox on.

Firefox release notes - What's new and known issues

Links to Firefox release notes for Desktop, Android and iOS.