OK, I filed https://github.com/whatwg/compat/issues/111 (though as noted there, I'm not sure other engines browsers need to care about this wart, since it only matters if UA sniffing determines you to be Firefox). I'm going to call this WONTFIX, per my thoughts on costs/benefits laid out at the beginning of comment 53.
Bug 1337655 Comment 57 Edit History
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OK, I filed https://github.com/whatwg/compat/issues/111 (though as noted there, I'm not sure other engines/browsers need to care about this wart, since it only matters if UA sniffing determines you to be Firefox). I'm going to call this WONTFIX, per my thoughts on costs/benefits laid out at the beginning of comment 53.