Hold your horses, depending on the machine you may not want to install FF. FF is a great browser, but it guzzles resources. I put Chrome on my dad’s PC and it really works a lot faster now.
FF Doesn’t start up as a memory hog, the memory it uses grows overtime. While it shouldn’t be doing it, and Mozilla def needs to address the issue, if you kill the process and re-open FF every few hours or so, you wont see speed issues.
Explain that to a 50 year old stubborn guy who won’t make the effort anyway. The browser is just on. Still I saw a difference in load when I installed chrome.