It is not available under the GPL, but under the Educational Community
License v. 1.0. This is a free/open license that is used by Sakai, the
Fedora institutional repository software, and a few other projects.
None of these are in Debian main currently.
(There have been remarks some time ago that the license may change to
ECL-2.0 sometime, which is GPL3 (but not GPL2) compatible.)
The extension can be easily downloaded from zotero.org & works as-is
under Debian. It is unclear to me what benefit making a package would
bring.
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