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Being advised that a website may not work optimally using Firefox

bufo0892
bufo0892
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Why do I get messages like those I've attached on certain websites?

Why do I get messages like those I've attached on certain websites?
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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
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I suspect the sites want to save software development/testing costs by reducing the number of supported browsers. But that's just a guess.

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