XPInstall

XPInstall (Cross-Platform Install) is a technology used by the Mozilla Application Suite, SeaMonkey, Mozilla Firefox, Mozilla Thunderbird and other XUL-based applications for installing Mozilla extensions that add functionality to the main application. A XPI (pronounced "zippy" and derived from XPInstall) installer module is a ZIP file that cont..
Found on http://en.wikipedia.org/wiki/XPInstall
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