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list-closed-tabs doesn't work on Fx46 and workaround

1

As of Firefox 46, list-closed-tabs ([最近閉じたタブを一覧表示して復元 - mooz deceives you](http://d.hatena.ne.jp/mooz/20091123/p1)) doesn't work because of syntax change of JavaScript. Error message: > "missing ] after element list" `var closedTabs = [[tab.image...