https://bugs.freedesktop.org/show_bug.cgi?id=107516
--- Comment #4 from Mike bugs.freedesktop.org@pm.port0.org --- (In reply to Emil Velikov from comment #3)
Indeed, this is Firefox's problem.
Аlthough security.sandbox.content.read_path_whitelist trick didn't work for me, I think this bug should be resolved as INVALID.