System Preferences -> Keyboard -> Shortcuts -> + icon. 

I've assigned user-defined shortcuts to Firefox on my Mac by adding items to: System Preferences -> Keyboard -> Shortcuts -> + icon. This method works fine in other applications. However, within Firefox these only work after I've clicked on the menu bar and displayed the item with the shortcut. For example, I have a shortcut to show the Bookmarks Toolbar defined as "View->Toolbars->Bookmarks Toolbar." In Firefox, under View menu I see the item "Bookmarks Toolbar" with the appropriate shortcut key shown next to it. BUT whenever I open a new window I have to show that menu item again before the shortcut key actually works. Is this a bug? I've tried different shortcuts, turning on/off private browsing, defining shortcuts under "All Applications" as well as "Firefox.app" Thanks in advance for your help!