.xpi file extension
- Cross-Platform Installer Module. A .xpi file is an installer module file,
used to install packages.
XPInstall (Cross-Platform Install) is a technology used by the Mozilla application Suite (Mozilla Firefox, Mozilla Thunderbird and others) for installing application extensions - allowing the functionality of the application to be extended. A .xpi file contains such an application extension.
A .xpi file is simply a zip file that contains a install script (install.js) or manifest file (install.rdf), plus other files required by the extension to be installed. The contents of a .xpi file can be viewed by renaming the file extension to .zip and then treating it as a .zip file.
.xpi files can be installed into FireFox by simply opening the file in FireFox (either clicking on a link to download a .xpi file or drag-and-drop a .xpi file into FireFox). FireFox knows that .xpi files are installer extensions and will install the extension for you.
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