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Why is the internet slow only on Firefox? All other browsers are fast.

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Why is the internet slow only on Firefox? All other browsers are fast.

Why is the internet slow only on Firefox? All other browsers are fast.

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You need to show the issue. Windows home or pro and what security software are you running besides MS Defender?

Do you have the same issue with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

Here is a screenshot of Lexus Japan and you can see that it took less than 3 seconds to load for me. see screenshot I'm on the east coast of the US and my laptop is plugged in.

Here is the add-on I'm using to show load time. https://addons.mozilla.org/en-US/firefox/addon/load-time/

Who are you using for DNS? I have cloudflare(1.1.1.1) set on my laptop, browser, and router.