@NaoPb Firefox starts in 2 seconds total for me on my 10 years old CPU, even with many plugins installed. While there are constantly 6 or more tabs open, most are not loaded in when starting Firefox, unless I click the tab itself. And opening a new private window is almost instant. I even use Firefox for reading PDFs, instead installing a dedicated application, because it is fast loading and does the job. All in all, it's probably not far away from Chrome in starting up Firefox. And it probably isn't that important, because the browser is open all the time for me.
As for the memory usage, I always thought Firefox is being bad here. Can't imagine Chrome being worse. Are people happy with that?