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
This patch uses the shared memory name prefixes introduced in bug 1447867 to prevent access to /dev/shm files of other applications or other processes within the same browser instance. When a shared memory implementation that doesn't use shm_open is available (specifically, the memfd_create support to be added in bug 1440203), /dev/shm access is completely denied. MozReview-Commit-ID: L2ylG5KrXTU