And when I shut it down it keeps running a process and sucking up memory that has to be manually shut down.
I have noticed that a couple of times now. You have to stop the process manually.
Me too. I actually sometimes stop FF and switch to Opera for a couple of hours. When you look in Task Manager, the CPU is being maxed out and the memory is jumping up and down too. Can the FF process, and they drop to very much lower percentages.
I admit I have an older PC, but up until 3-4 months ago I didn't have this problem. I think it's safe to say that it's a recent upgrade that's brought this on.