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When I get into my email, the back and forward no longer works.

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When checking my mail, I will click on a site, then click again to view something within; the arrows (back/forward) fade and no longer function, thus not able to use.

When checking my mail, I will click on a site, then click again to view something within; the arrows (back/forward) fade and no longer function, thus not able to use.

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Probably the "Babylon" toolbar if Thunderbird is involved. Firefox does not do email. though.

Clear your cache -- Tools > Options > Advanced > Network > Clear now (simple to do, but not directed at any specific problem)

Extensions that may interfere with Back Button, and these are already listed in Problematic extensions for other reasons -- Q805964