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Is there any way to block certain specific web-sites, that I do not wish to visit (even accidentally)?

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Is there any way I can block certain specific web-sites, that I do not wish to visit anymore, even accidentally? And I do not mean the general content filters: I need a way to define the sites that will be blocked myself (my problem has basicly nothing to do with the content of those sites).

Is there any way I can block certain specific web-sites, that I do not wish to visit anymore, even accidentally? And I do not mean the general content filters: I need a way to define the sites that will be blocked myself (my problem has basicly nothing to do with the content of those sites).

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The simplest time-saving extension to keep you from accidentally visiting certain sites is at https://addons.mozilla.org/en-US/firefox/addon/4476