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Why does Firefox keep asking me to add the same add-on over and over again? Even after I've installed it.

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I install the suggested add-on, in this case "Quicktime." Then seconds later, Firefox asks me to install "QuickTime" again. I already have "QuickTime," so I don't know why I'm asked over and over again. This is probably the 10th time this week. How do i make it stop asking?

I install the suggested add-on, in this case "Quicktime." Then seconds later, Firefox asks me to install "QuickTime" again. I already have "QuickTime," so I don't know why I'm asked over and over again. This is probably the 10th time this week. How do i make it stop asking?

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This usually happens if the MIME type that is needed for that content isn't enabled in the QuickTime Preferences. So you need to look there.

See http://kb.mozillazine.org/QuickTime