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I want to block certain websites

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While I am having problems with facebook and loads of unwanted ads, is there any way I can permanently block certain websites or ads from Firefox?

While I am having problems with facebook and loads of unwanted ads, is there any way I can permanently block certain websites or ads from Firefox?

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Having a hosts file on Windows systems, and in Firefox use of the Adblock Plus extension with subscriptions are two major methods of blocking sites and/or files. With Adblock Plus you can block advertisements without blocking the site itself.