1. I have just upgraded to Firefox 3 beta 5 and have exactly the same issue. When I click the back or forward button in firefox, instead of moving one page back or forwards, it drops down the history. Hmmm. Annoying.

  2. I had the same issue and found the problem. I had the proto theme installed in Firefox.

    I went into the firefox pull-down menu: TOOLS – AD ONS – Themes
    and disabled the theme. Now the forward and back buttons work as expected.

    Hope this helps.

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