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How can I open an XPI file extension?

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I downloaded cooliris-1.12.0.36949-fx-win.xpi and am unable to install because of the xpi file extension.

I downloaded cooliris-1.12.0.36949-fx-win.xpi and am unable to install because of the xpi file extension.

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Windows doesn't recognize that file type, but Firefox does.

Drag that XPI into the Firefox browser to install it. Or use File > Open File to install it.

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