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|User since||September 9, 2012|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
I just did it for tb 15. You have to modify three files (all the install.rdf), not only one, directly into the archive and then update the archive to save your changes.
I downloaded it from tb add-ons instead of fx add-ons. The xpi file contains everything for both tb and fx.