Script
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StackExchange chat links JS - Adds a chat link to the left hand nav of the home page of all Stack sites followed by a lightly filtered list of recently active chat rooms
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StackExchange obvious followed link color JS - Change the color of followed links on all StackExchange sites so they they are easily distinguishable.
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StackExchange hide closed questions JS - Hide closed questions on the home page and in other lists of questions. Put a link showing the number of closed questions that have been hidden that shows the closed questions again.