Some wikis have its content in other namespaces besides the main namespace. E.g. English Wikibooks has a "[[b:Cookbook]]" namespace (for recipes) and Portuguese Wikipedia has an "[[pt:Anexo]]" namespace (for lists and other stuff).
As of r83924, ext.articleFeedback.startup.js has the following test:
mw.config.get( 'wgNamespaceNumber', false ) === 0
Instead of this, the extension should check if the the current wgNamespaceNumber is in a predefined list of namespaces (configurable per wiki).
Version: unspecified
Severity: enhancement