I've been making a little bit of progress on this. I'm kind of blocked by what appears to be a quirk with dh_webext, but otherwise I'm getting close to having a working package: alioth-lists.debian.net/pipermail/pkg-mozext-maintainers/2020-July/008575.html
In the interim I've been getting started on the debian/copyright. Things I have done: * upstream/metadata, watch file with digital signature * cleaning bundled npm modules before build time (no repack needed) * install Info documentation and register with doc-base
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