Lawrence "The Dreamer" Chen's Blog

userChrome.css

/* Multi-row bookmarks toolbar */
#bookmarksBarContent {display:block !important;}
.places-toolbar-items {display:block !important; height: 48px !important; overflow-y:auto!important;}
#bookmarksBarContent toolbarseparator {display:inline !important;}
#bookmarksBarContent .bookmark-item {visibility: visible !important;}
.chevron {height: 0px !important;}

Follow up:

user.js

// Allow Javascript to change the context menu?
user_pref("dom.event.contextmenu.enabled", false); // Default: true