Troubleshooting
Fix slowness, crashing, error messages and other problems
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.
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"
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.
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.
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.
Report breakage due to blocking
How to report a broken website and what information Mozilla receives when you report breakage caused by Enhanced Tracking Protection.
Rate your Firefox experience, surveys and out of date messages (Heartbeat)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.
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.
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.
Task Manager - see whether tabs or extensions are slowing down Firefox
Firefox's Task Manager feature shows you performance information, such as what tabs or add-ons are making Firefox slow.
What happened to Firefox Send?
[https://send.firefox.com/ Firefox Send] has been discontinued as of September 17th, 2020. Thank you for trying Firefox Send in the past.
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.
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.
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.
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.
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.
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.
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.
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.
How to fix Pocket login issues
Learn how to add an exception for Pocket in Firefox, to prevent being prompted to log in to Pocket when saving to the site.
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.
Compatibility with Exploit protection on Windows
Firefox Compatibility with Windows Exploit protection.
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.
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.
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.
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.
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.
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.
Fix printing problems in Firefox
Learn how to troubleshoot and fix printing problems in Firefox.
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.
Avoid crashes - Tips and tricks
Here are some easy things you can do to avoid crashes and keep Firefox running in tip-top shape.
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.
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.
Latest Firefox issues
This article links to solutions for the latest Firefox issues like problems with Flash not loading or crashing.
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.
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.
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.
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.
