Performance and connectivity
Crashing and slow performance
Troubleshoot issues with app crashes or slow performance.
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.
Firefox blocked by macOS 15 Sequoia firewall - What you need to know
Some macOS 15 users may have Firefox blocked by the firewall. Learn about the issue and how to help Mozilla investigate.
Mozilla Crash Reporter
The Mozilla Crash Reporter dialog box appears when Firefox crashes and lets you send a crash report. Learn how it works and how to access your crash reports.
Firefox won't start - find solutions
This article explains what to do if the Firefox window does not open or you get an error message when you try to start Firefox.
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.
Identify problems caused by third-party modules in Firefox for Windows
Identify problems caused by third-party modules in Firefox for Windows.
Firefox crashes - asking for support
If nothing in the documentation seems to resolve issues with a Firefox crash, our community support forum volunteers may be able to help.
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.
Updating processor microcode
Processor bugs may cause crashes. Microcode updates address processor bugs.
Crash on Broadwell-U with old microcode
Intel Broadwell-U processors need a microcode update to avoid Firefox crashes
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.
Difficulties opening or using a website in Firefox 100
A potential temporary solution if a web page is not opening correctly in Firefox 100.
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.
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.
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.
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.