Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding

https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

You can check the connection settings.

• Settings -> General -> Network: Connection -> Settings

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

• https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors
• https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
• https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

I have uninstalled the last couple of Windows updates including a Security update, and I got the speed back. I've looked at Widows Update now and there are two Windows 10 updates available but no Security Update, which worries me. I've disabled Updates for a few days. Any advice would be most welcome. I do not want to use Edge as my default browser.

What updates did you remove?

You should also try asking here: https://support.microsoft.com

http://answers.microsoft.com/en-US/windows/forum/windows_10

I have the same problem. I switched to Firefox as my default browser a couple of weeks ago and had no problems. However, earlier this week, Firefox started running exceptionally slow. Windows 10, Firefox version 94.0.1. Internet speed is 56 d/l. With Chrome, it's 300 mpbs. I tried the Troubleshooting mode but it didn't do anything. If I can't get my internet speed back, I'm going to have to switch back to Chrome. Is there an easy fix for this?

djsomers Are your other web programs working properly?

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

Starting Any Computer In Safe Mode (web link) Free Online Encyclopedia

https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10/ +++++++++++++++++++++++++++++++++++++++++++++++ If the problem goes away with the computer in Safe Mode, the problem is with one of the other programs on the system.

As a test, disable your protection programs.