Experimental script for Firefox to get fixed position elements like menu bars out of your way. On most sites, setting them to Static will return them to their normal positions. In some cases, you may need to hide them if that doesn't work.
Tested on 3 sites so far. Please report problems using the Feedback tab.
Note: If the site uses a custom context menu, this script backs off and does not modify the context menu.
Note: I don't know how to change the position of the new items on the menu.