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Performance and connectivity

Performance and connectivity

Deal with error messages, crashing applications, connectivity issues, and slow performance.

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Secure connection failed and Firefox did not connect

How to troubleshoot time related errors on secure websites

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

Fix "The bookmarks and history system will not be functional" error message

Captive portal detection

Connection settings in Firefox

How to troubleshoot security error codes on secure websites

Warning Unresponsive script - What it means and how to fix it

Diagnose Firefox issues using Troubleshoot Mode

Troubleshoot and diagnose Firefox problems

What do the security warning codes mean?

Firefox uses too much memory or CPU resources - How to fix

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

Firefox can't load websites but other browsers can

Resist Fingerprinting

Firefox DNS over HTTPS

Firefox hangs or is not responding - How to fix

How do I report a broken site in Firefox desktop?

Use the Troubleshooting Information page to help fix Firefox issues

Websites look wrong or appear differently than they should

Certificate contains the same serial number as another certificate

How to let Firefox use the internet on your Windows computer

Unload inactive tabs to save system memory in Firefox

How to fix the Update Failed error message when updating Firefox

"Firefox is already running but is not responding" error - How to fix

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

DNS over HTTPS (DoH) FAQs

Disable Firefox Sync

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

Firefox blocked by macOS 15 Sequoia firewall - What you need to know

Quick fixes if your Firefox slows down

Where to go for developer support

HTTPS-First upgrades to secure connections

Firefox does not work - Common fixes to get you back up and running

How to reset the default user agent on Firefox

X-Mouse Button Control in Firefox 110

Firefox takes a long time to start up

Firefox uses too many CPU resources - How to fix

Websites say that Firefox is outdated or incompatible even though it's the latest version

Server Not Found - Troubleshoot connection problems

Firefox says it's just updated every time it starts - how to fix

Memory constraints, Firefox performance and Firewalls

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

How to resolve weak crypto error messages on Firefox

64-bit Firefox crashes with Citrix's XenApp VM

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

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

Difficulties opening or using a website in Firefox 100

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

Address screen sharing issues with Firefox on macOS 15 Sequoia

Troubleshoot Firefox crashes (closing or quitting unexpectedly)

Firefox is stuck in Troubleshoot Mode

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

Firefox keeps crashing at startup

Fix video and audio problems on Firefox for Windows N editions

Avoid crashes - Tips and tricks

Problems with email and how to find help

Home page with pipe character opens extra tabs when Firefox starts

How to run Firefox when your profile is missing or inaccessible

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