![]() ![]() The W^X protection should end up shipping in released form for Firefox 46. ![]() Using W^X on Firefox can cause a little overhead with the worst performance being found on OS X (reportedly around 4%) due to a slower mprotect implementation where as other platforms should be impacted by less than 3%. Portable Firefox OS X I've packaged a Mac OS X version using this script so you can launch it with a double click from any device: /bin/sh here'dirname \'0\'' echo 'Starting Firefox from 'here'.' echo 'Wait a while before Firefox start.' sh 'here/app/Firefox. The support uses VirtualProtect on Windows and mprotect for non-Windows platforms. The Write XOR Execute protection now works for Mozilla's SpiderMonkey JavaScript engine for all platforms where as previously the JIT engine needed read-write-execute permissions. ![]() Now as of last week, the nightly builds of Mozilla's web browser there is W^X JIT-code enabled in Firefox. ![]() As explained in that earlier article, W^X implies "a memory policy of W^X - write xor execute where memory can be marked as writable or executable but not both, in order to fend off potential exploits." One of the biggest roadblocks that OpenBSD faced enabling W^X were JIT engines of web browsers. OpenBSD has been leading the charge on using W^X by default - Write XOR Execute. Firstly if the email/text addressed you as ''Dear Member'' / ''Customer'' / ''Client'' OR your ''email address'' then that confirms its a spoof as paypal would address you by your full name eg Dear John Smith. As another recent Firefox Nightly change besides enabling WebGL 2 by default is that Firefox's just-in-time compiler supports W^X protection. ![]()
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