Try Status-4-Evar Rated 5 out of 5 stars

From: http://support.mozilla.com/en-US/kb/what-happened-status-bar#w_the-new-status-bar
How can I get the old Status Bar back?
The old Status Bar is dead, long live Status-4-Evar! Status-4-Evar is an Add-on that recreates all of the features of the old Status Bar and lets you put them in the new Add-on Bar.