Same here. The way I noticed the slowness was that I am used to opening up a new tab and immediately typing in my url or search. Whatever speed comes naturally to me, Chrome can handle it. Firefox would lag in ways that resulted in half of what I typed being cut off and other odd behavior. I am positive that Firefox is (or was, when I tried it last year) slower than Chrome in this regard, which was incredibly frustrating and caused me to switch back to Chrome within a week.