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Secure connection failed and Firefox did not connect

How to troubleshoot time related errors on secure websites

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

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

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

What do the security warning codes mean?

Troubleshoot and diagnose Firefox problems

Mozilla Crash Reporter TB

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

Crash reports in Firefox for Android

Firefox can't load websites but other browsers can

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

Troubleshoot Mode Thunderbird

Resist Fingerprinting

Firefox DNS over HTTPS

Firefox hangs or is not responding - How to fix

Certificate contains the same serial number as another certificate

Use the Troubleshooting Information page to help fix Firefox issues

Rebuilding the Global Database

How do I report a broken site in Firefox desktop?

Websites look wrong or appear differently than they should

How to enable Always-on VPN on Android

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

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

How to let Firefox use the internet on your Windows computer

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

Connecting to unsecured networks while using Mozilla VPN

Compacting folders - Potential complications

How Thunderbird for Android avoids leaking your IP address to SMTP servers

How to fix the Update Failed error message when updating Firefox

How can I tell if Mozilla VPN is connected?

HTTPS-First upgrades to secure connections

Quick fixes if your Firefox slows down

Where to go for developer support

DNS over HTTPS (DoH) FAQs

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

Unload inactive tabs to save system memory in Firefox

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

Crash reports in Firefox for iOS

Server Not Found - Troubleshoot connection problems

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

How to reset the default user agent on Firefox

Some videos won't play in background

Disable Firefox Sync

Profiling Thunderbird Performance

Joining public WiFi while on Mozilla VPN

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

Troubleshooting speed issues on Mozilla VPN

How do I report an issue with Firefox Relay?

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

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

How can I help by submitting mobile performance data?

Memory constraints, Firefox performance and Firewalls

Thunderbird makes unrequested connections

Rebuilding Global Database

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

How to resolve weak crypto error messages on Firefox

Certificate warnings in Firefox for iOS

64-bit Firefox crashes with Citrix's XenApp VM

How to obtain the Mozilla VPN Logs

What is the Mozilla VPN kill switch?

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

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

Difficulties opening or using a website in Firefox 100

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

How do I contact MDN Plus support?

How can I help submit and resolve bugs in the MDN content repo?

Where can I get help with the MDN API and documentation?

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

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

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