Gmail performance is pretty horrific, for what it does. It used to be even worse (twice as much memory and CPU as Youtube according to about:performance), but they've improved a bit since then.
It was once unusually fast on FF right after google shortage a couple of month ago. Everything I click was instant, never had those kind of experience.
Now I feel like it's slow on both. There might be a priority issue but I doubt its slowness is FF only.
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