This is the add-on I use to show load speed. https://addons.mozilla.org/en-US/firefox/addon/load-time/ You need to provide proof of the issue. Do you have the same issue with Firefox in [https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf Troubleshoot Mode]? Did you try clearing the browser cache? https://support.mozilla.org/en-US/kb/how-clear-firefox-cache# You can also Refresh Firefox. https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings What OS? What version of Firefox? Name a few sites that you feel are slow for you. Are you on WiFi or plugged in? Who are you using for DNS If windows, try this app to see if you can find a better DNS provider. see screenshot https://www.grc.com/dns/benchmark.htm See example load time for Lexus Japan from US East coast. see screenshot