Performance and connectivity Deal with error messages, crashing applications, connectivity issues, and slow performance. ஆங்கிலத்தில் Secure connection and security warning error pages in Firefox Server Not Found - Troubleshoot connection problems Troubleshoot time-related errors on secure websites Fix "The bookmarks and history system will not be functional" error message Captive portal detection Fix error “Website will not allow Firefox to display the page.” Use Troubleshoot Mode in Firefox Troubleshoot security error codes on secure websites Troubleshoot and diagnose Firefox problems Task Manager - see whether tabs or extensions are slowing down Firefox Crash reports in Firefox for Android Fix Firefox using too much memory or CPU resources Resist Fingerprinting Firefox can't load websites but other browsers can How can I tell if Mozilla VPN is connected? Troubleshoot Mode Thunderbird Firefox hangs or is not responding - How to fix What do the security warning codes mean? How Thunderbird for Android avoids leaking your IP address to SMTP servers DNS over HTTPS (DoH) FAQs How do I report a broken site in Firefox desktop? Unload inactive tabs to save system memory in Firefox Warning Unresponsive script - What it means and how to fix it Websites look wrong or appear differently than they should Use the Troubleshooting Information page to help fix Firefox issues Rebuilding the Global Database Disable Firefox Sync Where to go for developer support Firefox DNS over HTTPS Joining public WiFi while on Mozilla VPN Quick fixes if your Firefox slows down Mozilla Crash Reporter TB How to reset the default user agent on Firefox Connecting to unsecured networks while using Mozilla VPN How to fix the Update Failed error message when updating Firefox What is the Mozilla VPN kill switch? How do I report an issue with Firefox Relay? How to let Firefox use the internet on your Windows computer "Firefox is already running but is not responding" error - How to fix Thunderbird makes unrequested connections Some videos won't play in background Compacting folders - Potential complications Where can I get help with the MDN API and documentation? Firefox blocked by macOS 15 Sequoia firewall - What you need to know Crash reports in Firefox for iOS Unsent crash reports in Firefox Certificate contains the same serial number as another certificate Rate your Firefox experience, surveys and out of date messages (Heartbeat) Drag and Drop errors with Firefox Launcher Process enabled and Windows UAC disabled - How to Fix How to obtain the Mozilla VPN Logs Report Site Issues on Firefox for iOS Solutions for "Can not create temp folder archive" error when installing Firefox (Windows 10) Identify problems caused by third-party modules in Firefox for Windows Troubleshooting speed issues on Mozilla VPN How to enable Always-on VPN on Android How can I help submit and resolve bugs in the MDN content repo? HTTPS-First upgrades to secure connections Unsent crash reports in Firefox for Android 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 Firefox does not work - Common fixes to get you back up and running How can I help by submitting mobile performance data? Memory constraints, Firefox performance and Firewalls Rebuilding Global Database How to resolve weak crypto error messages on Firefox Certificate warnings in Firefox for iOS 64-bit Firefox crashes with Citrix's XenApp VM Connection settings in Firefox 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 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? Why do I see a white screen after updating Mozilla VPN to version 2.8.3? Troubleshoot Mozilla VPN connection problems Firefox hangs when copying with Suggested Actions enabled on Windows 11 - What to do X-Mouse Button Control in Firefox 110 RCS messaging and Mozilla VPN 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 Fix video and audio problems on Firefox for Windows N editions Avoid crashes - Tips and tricks Problems with email and how to find help Firefox keeps crashing at startup Home page with pipe character opens extra tabs when Firefox starts How to run Firefox when your profile is missing or inaccessible