How to reduce the address toolbar size in Firefox?

Hi all,

I posted this topic elsewhere but didn't get answer yet.
So, I may post it here hoping to find the right answer.
Well, I would like to reduce the size of URL address toolbar, or better to customize it in a manner that its size fits to the length of URL being visited in Firefox.
I mean that if the URL is long, for example (useless to click, a fake example!): http://www.urlverylongblablablablablablabla.com), the URL bar length should extend accordingly and if it is short (ex. http://www.ff.com) the size of URL toolbar should also be short accordingly.
I tried to insert a flexible space on right of the bar and drag it on left but this didn't work.
So, does somebody has a trick to customize the URL bar size, and benefits of the gained space to stick another bar utility?

Thank you in advance

Doesn't seem to work with FF 5.0.

(Or maybe I'm just a klutz...)

Thanks, t-4-2, I would like to do this in Firefox. I had to precise it, post edited.

t-4-2 said:

As pointed by profdp, this doesn't work for FF.

You can fully expand the bar by moving items around.
Is that what you're looking for?

Actually, I would like that the address toolbar shrinks or expands automatically in according to the length of the URL address.
Or, reduce its size permanently. I don't need necessarily to see the entire URL. So, if the part of url next to (.com) is hiden, this is not problem! It could be visible upon selection or when pointing the bar.