When opening Firefox with a url, the url does not display in the address bar

[rikai]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release)
Build ID: 20130627161625

Steps to reproduce:

When opening firefox (Alt+f2 then type "firefox http://localhost" in Linux Mint), the URL does not display in the address bar, instead it says Search or enter address. This stays in the URL bar until I create a new tab and navigate, use a link on the current page, or use the address bar to navigate.


Actual results:

When firefox loads, the address bar says "Search or enter address." instead of the website URL.


Expected results:

The website URL should appear.

as per this bug report...

[rikai]

Confirmed this, happens on all OSes, it seems, unsure why.