High Quality Content by WIKIPEDIA articles! 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. An XPI (pronounced "zippy" and derived from XPInstall) installer module is a ZIP file that contains an install script or a manifest at the root of the file, and a number of data files. In Mozilla, Firefox < 0.7, and Thunderbird < 0.5, the package contained a JavaScript install script (install.js) with some directives for actions to take during an install, including adding files and directories, removing old or obsolete files and directories, executing command line tools, etc.

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