Are you using Kubuntu, Ubuntu, Xubuntu, Edubuntu? I am using Kubuntu and Ubuntu, and both machines are updated recently. I do not witness this problem, nor can I create it by messing around with the menu buttons.
Did you install any extra "Extensions"? Extra buttons? Have you done anything to your Firefox setup that wouldn't make it "default"?
Are you using Kubuntu, Ubuntu, Xubuntu, Edubuntu? I am using Kubuntu and Ubuntu, and both machines are updated recently. I do not witness this problem, nor can I create it by messing around with the menu buttons.
Did you install any extra "Extensions"? Extra buttons? Have you done anything to your Firefox setup that wouldn't make it "default"?