Recently replaced my hard drive after a crash, and discovered that my computer is processing very slowly. Looking at my running processes, I've found that Firefox is using between 130K and over 200K of memory, and the number tends to climb drastically before dropping a bit then climbing again. The plugin container seems to be the culprit, or at least part of the problem, since I'll often quit Firefox but it continues to run. I've disabled every plugin and addon I had (not many of either, and nothing esoteric), and it's still using over 140K of memory and slowing my computer.

Edited to add: Now that I've had FF running for a while, despite having all of my plugins and addons disabled, FF is using between 169K and 212K of memory.