Firefox extension: Search bar of Autosizer

Short description:
Extends the search border automatically when typing, as soon as necessary, and it shrinks again, if it is empty.
This is above all useful, if the address and search border are next to each other. So both can be always as large as possible.
Can be specified the mindest and the maximum width as well as to be inserted something empty space within the border, in order to facilitate a clicking.
For Firefox 2,0 - 3.0a4