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i want to block some websites, that no one can open them, so how can i block ???

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there are my friends , they are using my pc, so i want to block Facebook, and youtube at my PC can i block these websites for them, but not for me...??? is there any setting for my firrefox browser like internet explorer???

there are my friends , they are using my pc, so i want to block Facebook, and youtube at my PC can i block these websites for them, but not for me...??? is there any setting for my firrefox browser like internet explorer???

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ok, i have installed that addon, now what i have to do, like how can i enter the website which i want to block , ???

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yes but before install you should upgrade your browser to Firefox 8