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
Currently, only user namespace support is detected. This is targeted at desktop, where (1) user namespace creation is effectively a prerequisite for unsharing any other namespace, and (2) any kernel with user namespace support almost certainly has all the others. Bonus fix: remove extra copy of sandbox flag key names in about:support; if JS property iteration order ever ceases to follow creation order, the table rows could be permuted, but this doesn't really matter.