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The 'Recently Closed Windows' under History is greyed and only restores some of the closed windows on startup.

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hnry11
hnry11
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Yesterday I had 4 windows open in Firefox 47 but today when I started Firefox only 3 appeared and the 'Recently Closed Windows' under History is greyed so the 4th window won't open.

Yesterday I had 4 windows open in Firefox 47 but today when I started Firefox only 3 appeared and the 'Recently Closed Windows' under History is greyed so the 4th window won't open.