Is it just me, or since 36 or 37, under Windows 7, vanilla (with flash) firefox instances are consuming too much memory and become laggy? I just reverted back to an old backup of firefox that I have, happens to be version 32, it has various of addons, dozens of open tabs, I've been using it for a day now- memory consumption is only 1.5GB (reflects the active tabs), and there's no lag.
I've tried disabling hardware acceleration with the newer versions, and I've tried using Flashblock while testing... the exact same misbehaviors. So is it possible that it has something to do with my specific setup/hardware/drivers? Or others experience the exact same faults?