Troubleshooting
Discover solutions for common issues and explore best practices to diagnose and resolve problems.
Website will not allow Firefox to display the page if another site has embedded it
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
Last updated: 05/23/2024
How to troubleshoot time related errors on secure websites
Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.
Last updated: 03/21/2024
Refresh Firefox - reset add-ons and settings
A Refresh can fix many issues by restoring Firefox to its default state while saving essential information like bookmarks and passwords.
Last updated: 12/03/2023
How to troubleshoot security error codes on secure websites
Learn about the error codes SEC_ERROR_UNKNOWN_ISSUER MOZILLA_PKIX_ERROR_MITM_DETECTED and ERROR_SELF_SIGNED_CERT on HTTPS websites and how to troubleshoot.
Last updated: 07/27/2023
Task Manager - see whether tabs or extensions are slowing down Firefox
Firefox has a feature that lets you see how much memory and CPU resources are being used by tabs, extensions and other processes. Learn more.
Last updated: 12/23/2023
How do I report a broken site in Firefox desktop?
How to report a broken website and what information Mozilla receives when you report breakage caused by Enhanced Tracking Protection.
Last updated: 02/22/2024
How to disable the Enterprise Roots preference
How to disable the Enterprise Roots preference to fix TLS connection errors caused by antivirus software, without compromising security.
Last updated: 06/05/2022
I'm having problems with my Mozilla account
Get answers for common questions about your Mozilla account.
Last updated: 12/20/2023
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.
Last updated: 11/21/2022
How to reset the default user agent on Firefox
Learn how to reset your Firefox "user agent" so that websites can detect your correct browser and version and work the way they should.
Last updated: 06/10/2022
Certificate contains the same serial number as another certificate
Why Firefox may show you a Secure Connection Failed error when you try to access the configuration page for your router and what to do.
Last updated: 03/10/2019
Rate your Firefox experience, surveys and out of date messages (Heartbeat)
You may be selected to rate Firefox or complete a survey. You may also see a notice to update Firefox. Learn more about these messages.
Last updated: 06/06/2022
How to pin and unpin Firefox from the taskbar on Windows 10 and Windows 11
Learn how to pin and unpin Firefox from the taskbar in Windows 10 and Windows 11.
Last updated: 05/14/2024
Total Cookie Protection and website breakage FAQ
Learn about Enhanced Tracking Protection and Total Cookie Protection in Firefox, and how to troubleshoot and report possible site breakage.
Last updated: 05/30/2023
X-Mouse Button Control in Firefox 110
Learn about an issue with X-Mouse Button Control in Firefox 110 for Windows.
Last updated: 03/02/2023
Use the Troubleshooting Information page to help fix Firefox issues
The Troubleshooting Information page has tools and details about your Firefox installation, that can help you solve problems with Firefox.
Last updated: 03/10/2023
I'm having problems confirming my Mozilla account
Here are some common solutions to help you resolve issues such as missing confirmation emails and outdated or locked Mozilla account status.
Last updated: 2 weeks, 5 days ago
Videos don't have sound on Citrix
How to fix audio problems when you try to watch videos while using the Citrix Server on Windows.
Last updated: 06/06/2022
Playing 4K (Ultra-High Definition) YouTube videos in Firefox
Why the 4K option shows up for some viewers while it doesn't for others.
Last updated: 06/05/2022
Firefox keeps asking me for Primary Password
How to resolve an issue where Firefox asks for a Primary (formerly "Master") Password if you have AVG or Eset Internet Security installed.
Last updated: 06/09/2022
What happened to Firefox Send?
Firefox Send has been discontinued as of September 17th, 2020. Thank you for trying Firefox Send in the past.
Last updated: 07/04/2023
Identify problems caused by third-party modules in Firefox for Windows
Identify problems caused by third-party modules in Firefox for Windows.
Last updated: 03/10/2023
Disable Firefox Sync on a lost phone or tablet
This article describes what you should do to prevent someone from accessing your passwords on a lost device with Firefox Sync.
Last updated: 10/29/2023
I've lost my Firefox Sync account information - What to do
This article explains what to do if you forget or lose your Mozilla account password and can't access your Sync account.
Last updated: 12/05/2023
Can I use my screen reader with the new Firefox?
Users on slower computers have reported problems viewing certain web pages with some screen readers in Firefox 57 and above. Learn more.
Last updated: 11/06/2020
Drag and Drop errors with Firefox Launcher Process enabled and Windows UAC disabled - How to Fix
How to fix Firefox drag-and-drop errors when running Windows as Administrator with UAC disabled and the Launcher Process enabled.
Last updated: 07/18/2020
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.
Created: 06/06/2021
Difficulties opening or using a website in Firefox 100
A potential temporary solution if a web page is not opening correctly in Firefox 100.
Last updated: 06/06/2022
Why aren’t my add-ons working on some websites?
Learn why some Firefox extensions have been disabled on certain websites, how to manage these limits, and explore alternative solutions.
Last updated: 07/09/2023
What do the SSLv3 error messages mean on Firefox?
When accessing a site with SSLv3, Firefox will block it and display an "Unable to connect securely" message.
Last updated: 11/01/2017
Sign up for Pocket with your Mozilla account
Pocket for Firefox lets you save articles for later. All you need is a free account. Sign up or sign in with your Mozilla account.
Last updated: 10/23/2023
Sign in to Pocket with your Mozilla account
Learn how to sign in to Pocket with your Mozilla account and resolve issues with signing in.
Last updated: 10/23/2023
Accessibility not available during multi-process support
Accessibility features are not yet fully supported in multiprocess Firefox. Restart Firefox to change it back to single process mode.
Last updated: 06/05/2022
Re-enable multi-process support disabled by Windows utilities
Some Windows accessibility tools might turn off Firefox's multi-process support. Here's how to re-enable it.
Last updated: 06/05/2022
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.
Last updated: 06/30/2017
I can’t play audio on a Remote Desktop Connection
How to solve a known issue with audio playback when you use Firefox on a Remote Desktop Connection.
Last updated: 06/06/2022
File system paths on Linux are always treated as UTF-8
On Linux, the profile path is required to be valid UTF-8. Names of downloaded files are encoded in UTF-8 regardless of glibc and glib settings.
Last updated: 01/18/2018
Facebook Container isn't working
What to do if Facebook Container doesn't work.
Last updated: 05/05/2021
Why is each open Firefox tab showing up in the Windows volume mixer?
If each open Firefox tab shows up in your Windows volume mixer, a fix will be released in Firefox version 76. Here is a workaround in the meantime.
Last updated: 05/19/2021
Unable to download files in Windows 10 when Parental Controls are on
There was a known issue in Firefox version 69 and Beta 70 that prevented you from downloading files in Windows 10 when parental controls were on.
Last updated: 12/31/2019
Workaround to make Estonian Smartcards work in Firefox 76+
Estonian Smart Cards are not working for some users in Firefox 76 and above. Here's how to make them work.
Last updated: 06/05/2022
Compatibility with Exploit protection on Windows
Firefox Compatibility with Windows Exploit protection.
Last updated: 06/29/2022
CCleaner is deleting Firefox extension settings in Firefox 79
Learn about workaround for a CCleaner but that's deleting saved Firefox extension settings in Firefox 79.
Last updated: 08/06/2020
How to fix an error when trying to open Telegram or Slack on Firefox
How to fix the NS_ERROR_DOM_ABORT_ERR while trying to open web.telegram.org or app.slack.com on Firefox 87 or above.
Last updated: 08/21/2022
Firefox hangs when copying with Suggested Actions enabled on Windows 11 - What to do
Firefox can freeze or stop responding when copying, with the Suggested Actions feature enabled on Windows 11. Learn how to fix the problem.
Last updated: 11/01/2022
Troubleshoot Firefox crashes (closing or quitting unexpectedly)
Learn how to troubleshoot and fix Firefox crashes, and find out how to get more help if you're having problems solving the issue.
Last updated: 12/17/2023
What to do when searches take you to the wrong search website
Firefox searches going to the wrong website can be caused by your Internet provider, an add-on, toolbar or malware. Learn how to fix this.
Last updated: 03/17/2024
Firefox is stuck in Troubleshoot Mode
Learn why Firefox may start in Troubleshoot Mode (previously known as "Safe Mode") when you expect it to start normally and how to fix it.
Last updated: 03/11/2023
Firefox repeatedly opens empty tabs or windows after you click on a link
Firefox may repeatedly open empty tabs or windows after you click on a link, forcing you to close Firefox. Learn how to fix this problem.
Last updated: 09/02/2022
Reset your Primary Password if you've forgotten it
You can reset your Firefox primary (formerly "master") password if you forgot it. Warning: This removes all saved usernames and passwords.
Last updated: 07/13/2022
Fix video and audio problems on Firefox for Windows N editions
If Firefox has trouble playing video or music on a Windows computer, you can install the Media Feature Pack, if it's missing. Learn more.
Last updated: 08/22/2022
Fix printing problems in Firefox
Learn how to troubleshoot and fix printing problems in Firefox.
Last updated: 04/08/2024
Problems with email and how to find help
Find out the right direction to get help using webmail in Firefox and links to support pages for popular web-based email services.
Last updated: 06/22/2015
Wrong home page opens when I start Firefox - How to fix
Learn how to restore your home page if a third-party software vendor changes it so that their page always opens when you launch Firefox.
Last updated: 06/17/2015
Avoid crashes - Tips and tricks
Here are some easy things you can do to avoid crashes and keep Firefox running in tip-top shape.
Last updated: 09/21/2021
Latest Firefox issues
This article links to solutions for the latest Firefox issues like problems with Flash not loading or crashing.
Last updated: 03/05/2015
Firefox keeps crashing at startup
If Firefox keeps crashing when you try to start it and other solutions don't work, a clean reinstall can often fix the problem.
Last updated: 11/09/2022
Home page with pipe character opens extra tabs when Firefox starts
Set up Firefox to open multiple home pages replacing the pipe character (|) with %7C.
Last updated: 06/13/2018
Can't add, change or save bookmarks - How to fix
This article shows you what to do if you cannot add new bookmarks or make other changes to your bookmarks.
Last updated: 09/25/2021
How to run Firefox when your profile is missing or inaccessible
How to fix the error ''Your Firefox profile cannot be loaded. It may be missing or inaccessible'' so that you can start and run Firefox.
Last updated: 08/05/2020
