That's pretty astounding to me. Firefox instantly eats 500+ mb of ram the moment I open it on Windows (16gb ram, i7 processor, ok video card). If I leave it open with one or two tabs (usually doesn't matter what sites), for about an hour, it goes up to 1.2gb to 1.4gb of ram consumption while doing nothing. If I close all tabs, the ram consumption doesn't drop, I have to close Firefox and restart it to accomplish that. It would be amazing to run more than 30 tabs. Once I leave Firefox open for a few hours, it basically becomes unusable performance wise. I've been using Firefox since it was released initially; Chrome never gives me this performance erosion problem, constantly tempts me to switch, I just happen to enjoy Firefox more. The sole extension I'm using is an ad blocker and my Firefox is always self-updated.