If you use the Add-On Manager to create the foundation to your Firefox extension, you might see that your description is literally "description" even though you've got a different value in <em:description> in your install.rdf file.

You've probably got this line in overlay.properties:
(where zoteroplay@genreacrossborders.org will be the id of your own extension)

That'll do it. /sigh The property "covers up" your longer description in install.rdf. Erase that line and your other description will show up.

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