another hacky attempt to correctly register addons' install.rdfs
dump debugging output to figure out why feathers aren't being registered
fix hang building hashtable with device manager
use reentrant monitor instead of monitor for device firmware updater
update _ensureAddOnEnabled to use Addon Manager
add internal name to make sure it gets written into extensions.sqlite and try to use it with feathers manager
attempt to triage rdf flushing failure
addon-metadata.rdf isn't getting written into the profile dir, causing the main window to fail to open
debugging output for addon-metadata.rdf during app startup
after the first run wizard finishes, the app needs to restart, which might be when the rdf is written initially, but unsure.