With FF version 29 my status bar vanished and I don't see any URL preview: when I hover over a link I want to see the URL associated to it!
The link previews are functioning (For example, when I view this page) in Firefox 34. They appear in the lower-left corner of the window in the same place where they would have been if the status bar still existed.
You need to install an addon called "The Status Bar (Restored)" along with "Status-4-Evar".
Firefox 29 completely removes all addon bar functionality and with it took away the URL preview which not even "Status-4-Evar" seems to put back, this addon puts back the addon bar and Status-4-Evar displays the link preview text within it.
I have the Status-4-Evar but it does not show the link in the status bar, but URL Tooltip (https://addons.mozilla.org/en-us/firefox/addon/url-tooltip) says it will display the destination URL when hovering cursor over a link.
Which should obviously be a default setting (as should ctrl+tab toggling between most recently viewed tabs). Thank God for extensions!
The old status bar is no longer available as part of Firefox 29. However, Mozilla recommends
as a solution for those of us that want a status bar.