Some sites take five to six times longer to load on firefox.
About:performance results. As an aside help section says About:performance should show up in menu/more and it does not. Do not care about that one but the slow loading of pages , twenty to thirty seconds vs. less than 1 on other browser and sister machine are driving us to another browser.
Michigan Weather Radar | AccuWeather may currently be slowing down Firefox.
MI Weather and Radar Map - The Weather Channel | Weather.com may currently be slowing down Firefox
No may be about it, yes they are. Used to load in a blink and still do in Edge browser and on sister machine.
This link will solve your problem.
Hope it helps