The behavior I'm seeing starts when you full screen an app that takes mouse lock. Once you in that state, You then alt tab to something else while still in full screen mode. Then alt-tab back to the browser, the PointerLock is no longer engaged even though the application is still in full screen mode.
I have successfully duplicated this in BananaBread: https://developer.cdn.mozilla.net/media/uploads/demos/a/z/azakai/3baf4ad7e600cbda06ec46efec5ec3b8/bananabread_1373485124_demo_package/index.html
I don't think this is Win8 specific (not a regression); I think this is just a bug that we have. Still important, the behaviour is unexpected. Firefox should take pointer lock back, but only if it's still in full screen. (If pointer lock was engaged in non-full-screen, we should leave it disengaged.)
Component: Event Handling → Widget: Win32
Hardware: x86_64 → x86
Whiteboard: [games:p?] → [games:p1]
Whiteboard: [games:p1] → [games:p?]
Priority: -- → P2
Whiteboard: [games:p?] → [games:p?][tpi:+]
Moving to p3 because no activity for at least 1 year(s). See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information
Priority: P2 → P3
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