The Statusbar is gone and the "lock" with it. Security information about a web page is shown by the Site Identity Button, which has been there since Firefox 3 came out.
https://support.mozilla.com/en-US/kb/Site+Identity+Button

You can add a padlock to the location bar with the Padlock add-on- https://addons.mozilla.org/firefox/addon/padlock-icon

I FEEL SO MUCH BETTER BEING ABLE TO SEE THE PADLOCK. A BIG THANK YOU!

You're welcome.

A security Padlock Icon should NOT have to be manually set up by the user. It should not be an Add-On, it needs to be a part of the standard build package. It has become a norm and expectation of web usability.

Not including the icon violates two of Jakob Nielson's Usability Heuristics for HCI (human computer interaction) principles -namely that of 'Visibility' and 'Consistency and Standards'. http://www.useit.com/papers/heuristic/heuristic_list.html

As this is a community driven web platform, the feedback is apparent to reintroduce it ASAP.

Check Since I updated tpo 4.01, I lost my status bar. In the View | Toolbars menu, the statusbar, which has be renamed to Add-on Bar, can be reenabled, or toggled on or off using the shortcut "Ctrl"+"/".

I was about to abandon Firefox 4 and return to Firefox 3.6 for the lack of a statusbar. I did Mozilla & Google searches, and was looking into adding the extension Status-4-Evar, or modifying CSS, to try to restore the statusbar. The solution, while well hidden, was far simpler, and the Firefox developers shouldn't have made it so difficult to find.