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This question already has an answer here:

I'd like to prevent myself from opening a given site (e.g. too soon after the last time it was opened. Is there a browser add-on (ideally - for Firefox) that does that? Or I should write it myself...

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marked as duplicate by slhck Sep 15 '13 at 19:59

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

There is an addon called Leechblock:

LeechBlock is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.

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