First question, which version of Firefox are you using? Just asking so that when people start to test / make suggestions, we are all on the same page.
Now, I'm running Waterfox 18.0.1, which should match functionally of Firefox 18.0.1.
If I open a new tab, and enter the following line in the address bar
I get what is shown in the above picture.
In my case, my links (the directory names) are clickable, and I can drill down into them, and go back up.
It appears to be working just like an FTP server would be working inside the browser, at least that is how I see it.
As far as I know, I made no change to Waterfox to get it to function that way. If you want, I can tell you exactly every modification I did make to the configuration menus from a default install.
Finally to compare, below is what I have in regards to Extensions, Appearance, and Plug-ins.Extensions NONE
Default 18.0.1 (the default theme)
Plugins that I have enabled
Shockwave Flash 11.5.502.146
Silverlight Plug-In 5.1.10411.0
I think the first step would be to verify that Firefox works the way it should with browsing your local C drive. Once that is working, then I would think what you have suggested should work for browsing network locations as well.
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