Note: Most screenshots are taken with a non-default theme for Firefox (Mostly Crystal) and visual style for Windows (Black Mesa V2). So, the colors may be different from your system but rest should be similiar.

Note: The following screens where taken from Searchbar Autosizer, but URL Bar Autosizer behaves very similar.

Autosizer's different sizing methods

Search Suggestions aren't bound to the width of the searchbar

Configuration Assistant (First Page) - Please choose your sizing method

Configuration Assistant with the user asked to size the searchbar

Configuration Assistant (Last Page)

Autosizer's options dialog for the more advanced