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Firefox 4 Menu Bar - When I hover over or select a menu bar item, the menu bar sub-menu becomes transparent and unreadable. Is this a known issue that can be corrected with an update or is it functionality that is not designed to work with this version?

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Firefox 4 Menu Bar - When I hover over or select a menu bar item, the menu bar sub-menu becomes transparent and unreadable. Is this a known issue that can be corrected with an update or is it functionality that is not designed to work with this version?

Firefox 4 Menu Bar - When I hover over or select a menu bar item, the menu bar sub-menu becomes transparent and unreadable. Is this a known issue that can be corrected with an update or is it functionality that is not designed to work with this version?

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I stopped having this issue when I enabled the menu bar. Right-click on an empty section of the tab strip and put a check next to menu bar. It was even still working fine when I disabled the menu bar again later.

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If this happens on monitor 2 of 2, this problem has been solved here:

http://support.mozilla.com/en-US/questions/794823#answer-157988

Go to "Firefox"--> "Options" --> "Advanced" Then un-check "Use hardware acceleration when available"

While not verified, I believe this problem is due to an SLI configuration where the focus is on monitor 1. (I.e acceleration is available, but only on monitor 1.)