TSF (Text Services Framework) is new API for IME on Windows. And also it supports not only CJK-IME, e.g., speech input system, handwriting system.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms629032%28v=vs.85%29.aspx

This will be enabled only on Vista or later since TSF on WinXP (and WinServer 2k3) has a lot of problems.

Additionally, currently we disable TSF when e10s is enabled since there are some critical bugs to use IME in this mode.

This was already enabled in Nightly builds for a long time and in Aurora builds since 38. So, if some critical bugs will be reported, we should disable it before release.

The bug to turn on:
https://bugzilla.mozilla.org/show_bug.cgi?id=478029

--
Masayuki Nakano <masay...@d-toybox.com>
Manager, Internationalization, Mozilla Japan.
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