jcatcw writes "While Firefox is very customizable, many of its settings aren't in the Options. Each setting is named and stored as a string, integer, or Boolean in a file called prefs.js and accessed via about
:config from the nav bar. Computerworld provides instructions on 20 tweaks for speeding up page loads, making tabs behave, reducing memory drain, and generally making the interface act the way you want it to. Customization also comes through the must-have FF extensions (but be sure to skip these)."
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Link To Original Article
The Secrets of Firefox about:config
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