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How to block a website from opening?

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I want to block a website(for e.g youtube) from opening, i.e i do not want any user to access that site.

I want to block a website(for e.g youtube) from opening, i.e i do not want any user to access that site.

All Replies (3)

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use an addon called "blocksite", in apr. of 2011 the edition is around version 0.7.x somewhat.

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how do i do that

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To get an add-on, try this:

Tools > Add-ons, then in the search box try block site

I haven't tried that one myself.

Were you able to install it?