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The Firefox Web browser is quickly becoming one of the most prominent Web browsers available. The fact that it is cross-platform makes it a comfortable browser for users who have to use more than one OS. There are, however, a number of hidden gems that you can enable that make Firefox even more powerful than it is out of the box.
To increase the speed of opening Web pages, there are two options you can tweak. The first is to enable HTTP pipelining, which allows Firefox to request multiple files simultaneously rather than one at a time. To enable this, type
about:config in the address bar. Scroll down the list until you find network.http.pipelining and set it to true. You can also enable network.http.proxy.pipelining as well.
To speed up rendering speeds, you can tell Firefox not to wait the default quarter second before drawing Web content. The option to look for here is the nglayout.initialpaint.delay, but it may not be displayed in the preference list by default. If not, right-click on the screen and select New Integer. Type nglayout.initialpaint.delay as the preference name and the number 0 as the value. By default, Firefox uses a value of 250 (in milliseconds).
Source - Vincent Danen, TechRepublic
