Packaging extensions

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Before releasing extension, you need to package it into an XPI file, so that others can easily install it with a few clicks. provides the most comprehensive technical document on packaging extensions. It explains the format of the install.rdf manifest for those wishing to create one from scratch. See install.rdf page for the list of tools and a template that make it easier to create an install manifest.

The Extension Manager—and hence the extension/theme packaging system—underwent a major revision with Firefox 0.9 and Thunderbird 0.7. If you wish to support earlier versions of these products, or the Mozilla Suite, you will need to provide the old-style install.js file as well as the new install.rdf.

The whole process for the new packaging system is made clear in both roachfiend’s tutorial and Jonah Bishop's toolbar tutorial. The tutorial on XulPlanet covers the old system (most of this tutorial also applies to new-style extensions too). Jed Brown also has a tutorial on repackaging old extensions in the new style.

There are also tools which will automatically package your extension files: bash build scripts, Windows build script, Googlebar Lite Perl build script, and a makefile.