Before the move to the event-driven global menupopup
Before messing with the menus once again.
Before taking out all the unnecessary menu creation and deletion code.
Before ripping out the three browser-specific functions.
Before a change to event-triggered popups.
Again, before some serious editing...
Before removing the addonManager.
Getting close -- before TB fix.
Looking close to done with this version.
Fix for PM's multiple Defaults.