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Why did firefox NOT show my windows and tabs from last session?

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When I opened firefox it had none of my windows or tabs from previous session and "restore previous session" is greyed out!

When I opened firefox it had none of my windows or tabs from previous session and "restore previous session" is greyed out!

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Firefox 20.0 - why such an old version?

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what does that matter?

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Sorry, but am I wasting my time asking for an answer? It's just that this (mozilla support) tells me I have 3 replies but I only received 1 email?

Ilungisiwe ngu cpsmortiATyahoo.com.au