Mason is described as 'This extension can simplify the rule to just specify the URI and Content type and can enable/disable each rule separately'. There are three alternatives to Mason for a variety of platforms, including Linux, Mac, Windows, Firefox and Google Chrome. The best alternative is Referer Control, which is free. Other great apps like Mason are RefControl (Free) and Smart Referer (Free, Open Source).
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Referer Control vs Mason opinions
pros, cons and recent comments
Mason WAS so much more than just refer changing/spoofing