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I have 5-8 WEB Sites that I want to block, how do I do it?

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Several sited I go to with some regularity have the bad habit of opening a new window and going to a WEB site that I want blocked. How do I block a specific WEB site?

Several sited I go to with some regularity have the bad habit of opening a new window and going to a WEB site that I want blocked. How do I block a specific WEB site?

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Go to the Mozilla Add-ons Web Page {web link} (There’s a lot of good stuff here) and search for what you want.