In particular, I inadvertently used "launch_url" instead of "launch_path", and it took me 15 minutes or so to figure out what was going on. Having the browser report the problem immediately would offered the much nicer developer experience of having been able to fix it instantly.
Component: Webapp Runtime → DOM: Mozilla Extensions
Product: Firefox → Core
QA Contact: webapp-runtime → general
No longer blocks: 746465
Component: DOM: Mozilla Extensions → DOM: Apps
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