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How do I block websites on my PC

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I am trying to block websites on my laptop and would like to do so without the use of an expensive filter. Is there a way of doing it on Firefox?

I am trying to block websites on my laptop and would like to do so without the use of an expensive filter. Is there a way of doing it on Firefox?

All Replies (1)

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Using the HOSTS file will block a web site for all browsers you have installed.
http://en.wikipedia.org/wiki/Hosts_file

Or use this for just Firefox.
https://addons.mozilla.org/en-US/firefox/addon/blocksite/