As is usual with mysterious "permission denied" errors, SELinux was the underlying cause. ...
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ID Status▲ Resolution Sev▼ Product▼ Comp Assignee▲ Reporter Summary
27116 ASSI --- enh Sisyphus firefox- nobody mike [FR] disable default browser check

File a new bug in the "firefox-fullscreen-kiosk" component of the "Sisyphus" product