Rated 3 out of 5 stars
Has unfortunately a conflict with: https://addons.mozilla.org/de/firefox/addon/menu-editor/
i miss with "Personal-Menu" to customize context menu in main window and tabs.
good is though, the menu changing option for the new FF-Menu-Button-Menu
good work, but improvable.. :)
Please make sure that you are using Menu Editor 1.2.7. The old version of ME has bug in Firefox 4.