In Firefox, there are numerous settings that aren't available in the options dialog. All of them, however, can be changes by typing about:config in the address bar of the browser.
Here's something that I found recently in the about:config (actually, a few things). The first is reminiscent of the old turbo buttons on PCs back in the day.
this defaults to false, so I set mine to true. I have no idea what this does because I also changed these values to true:
I read somewhere that it makes a speed difference, but I was actually amazed. I mean, everyone says that Firefox is faster than IE, but sometimes it is hard to tell. With these set to true, I've done tests giving IE a head start and Firefox wins every time. So, go turn your turbo on.