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About this Add-on
I thought it might be of use to some other people out there. The source is on github at https://github.com/darktrojan/zippy - I'm happy to consider pull requests.
Zippy can either package everything in your extension's folder (it deliberately ignores .zip and .xpi files), or it can use a white-list approach. If your extension's root folder has a file named
xpi.list, it will only package files listed there (one line per file, including a line for each directory). Listing
directory/* will package everything in that directory.