This one looks interesting:

Speed up page rendering
By default, Firefox doesn't try to render a web page for 250 milliseconds, because it's waiting for data. If you add the code below to your user.js file, Firefox immediately tries to render the page, even without complete data. The drawback is on slower machines where doing a "reflow" may actually cause the total page load time to be longer.
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Remind me to change my signature to something more interesting someday