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back arrow grayed out, how do I fix it?

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I have to use 3.6 for my online school work. I cannot get a back arrow, as it is grayed out. I have tried reinstalling, along with other recommended fixes, and nothing has helped. Can you help me?

I have to use 3.6 for my online school work. I cannot get a back arrow, as it is grayed out. I have tried reinstalling, along with other recommended fixes, and nothing has helped. Can you help me?

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On Firefox 4, the back button does not work on a new browsing tab or window. | Firefox Support Forum | Firefox Help

https://support.mozilla.com/questions/805964

Extensions that may interfere with Back Button, and these are already listed in Problematic extensions for other reasons

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Do the keyboard shortcuts work Alt+"left-cursor-arrow", Alt+"right-cursor-arrow"

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Here's an interesting one (makes no sense) -- Back/Forward Home don't work in 7.0.1 due to network.http.max-connections being upped to 256, reduce back down to 32, and restart Firefox.