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Discover solutions for common issues and explore best practices to diagnose and resolve problems.

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How to troubleshoot time related errors on secure websites

Website will not allow Firefox to display the page if another site has embedded it

Microsoft OAuth Authentication and Thunderbird in 2024

Refresh Firefox - reset add-ons and settings

How to troubleshoot security error codes on secure websites

Mozilla Crash Reporter TB

Profiles - Where Thunderbird stores your messages and other user data

Task Manager - see whether tabs or extensions are slowing down Firefox

I'm having problems with my Mozilla account

How to disable the Enterprise Roots preference

Cannot send messages

How do I report a broken site in Firefox desktop?

Recover user data missing after Firefox update

Troubleshoot Mode Thunderbird

Cannot receive messages

Rebuilding the Global Database

How to opt out of studies on Firefox for iOS

Drag and Drop errors with Firefox Launcher Process enabled and Windows UAC disabled - How to Fix

Sending and Receiving Messages on Thunderbird

I'm having problems confirming my Mozilla account

End of support for Firefox Lite

Mozilla VPN won’t connect or keeps disconnecting - How to fix

Disable Firefox Sync on a lost phone or tablet

FAQ Changing IMAP to POP

How to reset the default user agent on Firefox

End of support for Firefox Lockwise

Use the Troubleshooting Information page to help fix Firefox issues

I've lost my Firefox Sync account information - What to do

Cannot delete messages

Sign up for Pocket with your Mozilla account

Rate your Firefox experience, surveys and out of date messages (Heartbeat)

Uninstall Firefox for iOS

Some videos won't play in background

Playing 4K (Ultra-High Definition) YouTube videos in Firefox

Unable to use profile when you launch an older version of Thunderbird

How to send a crash report on Firefox for Android

Profiling Thunderbird Performance

Compacting folders - Potential complications

Identify problems caused by third-party modules in Firefox for Windows

Troubleshooting speed issues on Mozilla VPN

I can't sign in to Mozilla VPN - What should I do?

Certificate contains the same serial number as another certificate

Hyperlinks in Messages Not Working

Can I use my screen reader with the new Firefox?

Firefox Sync takes too long to sync or send pages from my iPhone or iPad

Firefox keeps asking me for Primary Password

Why is each open Firefox tab showing up in the Windows volume mixer?

I forgot my Mozilla account password and I can't sign in to Mozilla VPN

How to pin and unpin Firefox from the taskbar on Windows 10 and Windows 11

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

How do I uninstall Mozilla VPN?

Total Cookie Protection and website breakage FAQ

Difficulties opening or using a website in Firefox 100

How do I contact MDN Plus support if I forgot my password for Mozilla account?

I forgot my Password for Mozilla account and I can't sign in to MDN Plus

Why do I get an error when I try to upgrade my subscription?

Firefox hangs when copying with Suggested Actions enabled on Windows 11 - What to do

Why aren’t my add-ons working on some websites?

Inbox or Other Folder Full

Rebuilding Global Database

How can I avoid to reach the "over quota" limits of my mail server?

I can't play videos or audio on Firefox for Android 5.0 (Lollipop)

Sign in to Pocket with your Mozilla account

Accessibility not available during multi-process support

Certificate warnings in Firefox for iOS

Re-enable multi-process support disabled by Windows utilities

64-bit Firefox crashes with Citrix's XenApp VM

I can’t play audio on a Remote Desktop Connection

I can't take screenshots of some websites on Firefox Lite

File system paths on Linux are always treated as UTF-8

Videos don't have sound on Citrix

Facebook Container isn't working

I can’t watch YouTube videos fullscreen on Firefox Lite

Unable to download files in Windows 10 when Parental Controls are on

How to obtain the Mozilla VPN Logs

Workaround to make Estonian Smartcards work in Firefox 76+

Compatibility with Exploit protection on Windows

What happened to Firefox Send?

CCleaner is deleting Firefox extension settings in Firefox 79

Report Site Issues on Firefox for iOS

Firefox for iOS won't load web pages

How to fix an error when trying to open Telegram or Slack on Firefox

Fritz!box isn't working when Mozilla VPN is on

How do I reset Mozilla VPN?

The language of the websites I visit changes when I turn Mozilla VPN on - What to do

How do I contact support for Relay Premium?

I forgot my password for Mozilla account and I can't sign in to Firefox Relay

Difficulties opening or using a website in Firefox Focus for Android 100

Why do I see a white screen after updating Mozilla VPN to version 2.8.3?

How to enable/disable the Firefox Relay icon on online fields and websites

What should I do if I'm redirected to the Firefox Relay FAQ when clicking a link within an email?

X-Mouse Button Control in Firefox 110

userChrome.css and .js and userContent are unsupported

Contact support from my Mozilla VPN app

How do I cancel my subscription to Firefox Relay?

How to delete my Mozilla account via the Mozilla VPN app on Android and iOS

Enable or disable Local Network Access on iOS

Troubleshoot Firefox crashes (closing or quitting unexpectedly)

What to do when searches take you to the wrong search website

Firefox is stuck in Troubleshoot Mode

Firefox repeatedly opens empty tabs or windows after you click on a link

Reset your Primary Password if you've forgotten it

Fix printing problems in Firefox

Fix video and audio problems on Firefox for Windows N editions

Avoid crashes - Tips and tricks

Firefox keeps crashing at startup

Latest Firefox issues

Problems with email and how to find help

Wrong home page opens when I start Firefox - How to fix

Home page with pipe character opens extra tabs when Firefox starts

Can't add, change or save bookmarks - How to fix

How to run Firefox when your profile is missing or inaccessible

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