A few times, the menu faded out and was no longer available from the keyboard or mouse until I closed Icecat and started it back up, but when I opened a new tab, the new Firefox 4 menu was still available with the mouse. I don't know a keyboard shortcut for it. I can't recall doing anything in particular to make the menu inaccessible—just time elapsing.
-- http://gnuzilla.gnu.org
