I love(d) Firefox! Now using Edge but don't like it for the reasons mentioned. With the same homepage on each, Edge is there is one second. Firefox takes anywhere from 7 to 20 seconds. Have tried every "fix" for FF I could find, all to no avail. I am too impatient I guess.
Firefox has been slowing down. That is one of the reasons I don't use it anymore. Pages would take forever to load. Didn't matter the machine or operating system.