Its been a while since I posted, but I wanted to share a setting that really shouldn't be enabled by default in Firefox.
I had been following various threads on Firefox memory usage, and after installing Firefox 10 I noticed Firefox started with something like 200 MB of RAM but quickly ballooned to some 500 MB after a few tabs open.
After some research, I tried out a setting in the
about:config page, and it literally halved my RAM usage, especially with large numbers of tabs.
This is the
image.mem.decodeondraw setting in Firefox.