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Showing content from http://support.mozilla.org/en-US/products/firefox/performance-and-connectivity below:

Performance and connectivity | Firefox Help

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

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• Crashing and slow performance
• Site breakages
• Connectivity
• Error codes

If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.

Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.

This article explains what to do if you see the error message “The bookmarks and history system will not be functional” when you start Firefox.

This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"

Description of how Firefox detects captive portal networks.

Your organization or Internet Service Provider may offer or require you to use a proxy to connect to the Internet. Learn more.

Learn about error code SEC_ERROR_UNKNOWN_ISSUER MOZILLA_PKIX_ERROR_MITM_DETECTED and ERROR_SELF_SIGNED_CERT on secure sites and how to troubleshoot.

Use Firefox Troubleshoot Mode (known as Safe Mode in previous versions of Firefox) to diagnose and fix problems. Learn more.

Firefox shows you a warning page about a potential security risk when you try to connect to a secure site but your connection is not secure.

This article includes a series of steps you can follow, that will help you fix most problems with Firefox.

Firefox has a feature that lets you see how much memory and CPU resources are being used by tabs, extensions and other processes. Learn more.

This article describes the reasons for this error message and covers possible solutions and workarounds.

Learn how to reduce Firefox's system resource usage for a faster, more stable browsing experience.

Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.

This article presents solutions and workarounds to a failed Firefox update so that you can get it updated and working correctly again.

Have questions about web development or Firefox Developer Edition? MDN Web Docs has many resources you'll need to build a better web. Learn more.

We have outlined a list of FAQs here that you may find helpful while getting up to speed with all that DNS over HTTPS (DoH) has to offer.

The Troubleshooting Information page has tools and details about your Firefox installation, that can help you solve problems with Firefox.

A "Server not found" error can be caused by Windows Firewall blocking Firefox from accessing the Internet. Learn how to configure it to allow Firefox access.

When Firefox hangs, it stops responding to clicks or keystrokes and seems to be frozen. This article has possible solutions, depending on when this happens.

Why Firefox may show you a Secure Connection Failed error when you try to access the configuration page for your router and what to do.

Learn how to reset your Firefox "user agent" so that websites can detect your correct browser and version and work the way they should.

How to report a broken website and what information Mozilla receives when you report breakage caused by Enhanced Tracking Protection.

DoH improves privacy by hiding domain name lookups from anyone lurking on public Wi-Fi, your ISP or others on your local network. Learn more.

Some macOS 15 users may have Firefox blocked by the firewall. Learn about the issue and how to help Mozilla investigate.

How to start Firefox if you see an error message, "Firefox is already running, but is not responding" or, on macOS, "A copy of Firefox is already open".

We'll explain errors such as "Server not found" or "Unable to connect" and how to fix problems where Firefox can't access websites but other browsers can.

Learn how to free up system memory by unloading inactive tabs in Firefox.

This article explains how to fix problems with websites that display incorrectly in Firefox or don't work the way they should.

If you can't connect to a website, you may see the Server Not Found error message. Learn how to troubleshoot and fix this error.

How to fix Firefox drag-and-drop errors when running Windows as Administrator with UAC disabled and the Launcher Process enabled.

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

This article describes some causes of a long start up time and steps you can take to improve it.

If you see "Firefox Updated" or "You've been updated to the latest version of Firefox" every time you start Firefox, we'll show you how to fix it.

The article covers the steps you can take to make Firefox run faster.

Learn how to turn off Firefox Sync if you’d like to use your Mozilla account without syncing data such as, bookmarks, history and tabs.

Firefox can freeze or stop responding when copying, with the Suggested Actions feature enabled on Windows 11. Learn how to fix the problem.

Learn about an issue with X-Mouse Button Control in Firefox 110 for Windows.

From version 136, Firefox implements HTTPS-First and always attempts to connect securely. If a secure connection fails it falls back to an insecure connection.

At times, Firefox may require significant CPU resources to display content. We'll show you options for fixing this if this if it is happening too often.

Some websites that need a specific browser or version make a mistake detecting your installed version of Firefox. We'll explain how to fix or work around this.

Find solutions to Firefox issues like crashing, not starting, slowness and websites not loading.

Firefox's performance can be adversely effected by memory constraint issues. Learn how to identify memory constraint problems and solutions.

You may be selected to rate Firefox or complete a survey. You may also see a notice to update Firefox. Learn more about these messages.

When connecting to a website that uses an invalid TLS certificate or weak encryption, Firefox will display an error page saying "Your connection is not secure".

The API hooks from Citrix XenApp 7.13 VDA do not work with 64-bit Firefox. How to find a workaround.

How to fix the NS_ERROR_DOM_ABORT_ERR while trying to open web.telegram.org or app.slack.com on Firefox 87 or above.

Stuck with the "Can not create temp folder archive" error on 7-Zip when installing Firefox for Windows 10? This article will help you to solve the issue.

A potential temporary solution if a web page is not opening correctly in Firefox 100.

Learn how to resolve screen sharing issues in Firefox when using macOS 15 'Sequoia' due to changes in Apple's API.

Learn how to troubleshoot and fix Firefox crashes, and find out how to get more help if you're having problems solving the issue.

Firefox may repeatedly open empty tabs or windows after you click on a link, forcing you to close Firefox. Learn how to fix this problem.

Learn why Firefox may start in Troubleshoot Mode (previously known as "Safe Mode") when you expect it to start normally and how to fix it.

If Firefox has trouble playing video or music on a Windows computer, you can install the Media Feature Pack, if it's missing. Learn more.

Find out the right direction to get help using webmail in Firefox and links to support pages for popular web-based email services.

Here are some easy things you can do to avoid crashes and keep Firefox running in tip-top shape.

If Firefox keeps crashing when you try to start it and other solutions don't work, a clean reinstall can often fix the problem.

Set up Firefox to open multiple home pages replacing the pipe character (|) with %7C.

How to fix the error ''Your Firefox profile cannot be loaded. It may be missing or inaccessible'' so that you can start and run Firefox.

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