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Dropdown menu mouseover highlights are ALL remaining as long as any item is highlighted. Have tried rebooting, enabling/disabling hardware accelleration, no luck. Screenshot here: http://i.min.us/idtrzs.png

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All dropdown menu items have their mouseover highlights remain onscreen as long as any single item is highlighted. Screenshot here: http://i.min.us/idtrzs.png

All dropdown menu items have their mouseover highlights remain onscreen as long as any single item is highlighted. Screenshot here: http://i.min.us/idtrzs.png

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Is it possible you have an incompatible theme installed?? If you are using a custom theme, try the default Firefox 4 theme:

orange Firefox button or Tools menu > Add-ons > Appearance

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Thanks for the quick reply, but I only have the default theme installed.