Prestaasjes en ferbining

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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

Connection settings in Firefox

Captive portal detection

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

Mozilla Crash Reporter TB

How to troubleshoot security error codes on secure websites

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

Resist Fingerprinting

HTTPS-First upgrades to secure connections

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

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

Rebuilding the Global Database

Firefox can't load websites but other browsers can

Troubleshoot Mode Thunderbird

Firefox hangs or is not responding - How to fix

How do I report a broken site in Firefox desktop?

DNS over HTTPS (DoH) FAQs

How to let Firefox use the internet on your Windows computer

How to enable Always-on VPN on Android

How to reset the default user agent on Firefox

Where to go for developer support

Disable Firefox Sync

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

Firefox DNS over HTTPS

Unload inactive tabs to save system memory in Firefox

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

How can I tell if Mozilla VPN is connected?

Websites look wrong or appear differently than they should

How to fix the Update Failed error message when updating Firefox

Server Not Found - Troubleshoot connection problems

Use the Troubleshooting Information page to help fix Firefox issues

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

Quick fixes if your Firefox slows down

Certificate contains the same serial number as another certificate

What is the Mozilla VPN kill switch?

Report Site Issues on Firefox for iOS

Connecting to unsecured networks while using Mozilla VPN

Joining public WiFi while on Mozilla VPN

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

Certificate warnings in Firefox for iOS

64-bit Firefox crashes with Citrix's XenApp VM

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

How to obtain the Mozilla VPN Logs

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

Retrieve a Pocket crash log on Android

Thunderbird makes unrequested connections

Some videos won't play in background

Compacting folders - Potential complications

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

Fritz!box isn't working when Mozilla VPN is on

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

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

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

How to find the Pocket app crash logs on iOS

RCS messaging and Mozilla VPN

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

Rebuilding Global Database

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

How to resolve weak crypto error messages on Firefox

Crash reports in Firefox for Android

Profiling Thunderbird Performance

Firefox for iOS won't load web pages

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

Troubleshooting speed issues on Mozilla VPN

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

How do I contact MDN Plus support?

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

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

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