@DSNET If you want to change the displayed extension name on Safari's Preferences window, changing CFBundleDisplayName (not CBBundleDisplayName) should work for Safari extensions too, but you need to reopen Safari to reflect it.
@DSNET If you want to change the displayed extension name on Safari's Preferences window, changing CFBundleDisplayName (not CBBundleDisplayName) should work for Safari extensions too, but you need to reopen Safari to reflect it.