Rated 5 out of 5 stars

In Firefox 4.0, the tab counter can be moved to the Tabs Bar in addition to anywhere in Menu Bar, or Location Bar in Firefox 3.6. This means one can make the tabs bar always visible even in full screen ("F11") and include the tabs count. The following styling includes color and different padding in the code to make the tab count really stand out which could be included via userChrome.css provide additional styling not available in the extension's options, but it is more convenient to use the "Stylish" extension, and is include in "Tabs Bar Minimal Size" -- http://userstyles.org/styles/9043/tabs-bar-minimal-size

/* "Tab Counter" Extension can be moved to the tab bar in Fx4.0 */
#tabcounter-toolbar-item {font-size:12px; font-weight:700 !important;
margin:0px !important; padding:0px 2px 0px 2px !important;background-color: yellow !important;
border:1px solid black !important;}

This review is for a previous version of the add-on (