Safari 9.0

You may still sign your Safari Extensions with your developer certificate for distribution outside of the Safari Extensions Gallery, but it will not be a candidate for automatic updating. Important: You must resubmit your Extension to Apple before it will be displayed in the Extension Gallery. Online submission is available at https://developer.apple.com/safari/extension-submission/. Force Touch T

[efcl]

Safari 9.0での変更点としてTemplate strings、Classes、WeakSet、SymbolなどのES6サポート、開発者ツールのデザインや機能追加などが行われている

[yfnt]

Safari 9.0

[teppeis]

Safari 9の変更点。ES6はClass, Computed props, WeakSet, Number強化, Octal/Binary literal, Symbol, Template literal