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start up Mozilla Crash Reporter TB Thunderbird makes unrequested connections Rate your Firefox experience, surveys and out of date messages (Heartbeat) Some videos won't play in background 64-bit Firefox crashes with Citrix's XenApp VM Drag and Drop errors with Firefox Launcher Process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