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In 3.6, "Close" command closed active TAB; in 4.0, it closes Firefox.

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I used a programmable mouse. Clicking the MOUSE WHEEL is equivalent to "CLOSE" ... and in Firefox 3.6 and earlier, it would close the active tab. NOW, in 4.0, it closes Firefox ... the whole program! I want it to just close the active tab, like it used to.