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why are videos blocked on firefox, not on Internet Explorer?

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why do you need an 'unblocker' on firefox, but not on internet explorer? - same videos run without a 'unblocker' on internet explorer

why do you need an 'unblocker' on firefox, but not on internet explorer? - same videos run without a 'unblocker' on internet explorer

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I have not heard of this before. Is there a particular website where you get a message that the videos are blocked? Can you provide a copy/paste of the message or a screenshot? If you have installed an unblocker, what is it called? (I would be very cautious, since programs and add-ons for getting videos to play is one of the top ploys for getting malware onto your computer.)

This article has suggestions on screenshots: How do I create a screenshot of my problem? Before posting, please blur or delete any personal/confidential information in the image.