Rated 4 out of 5 stars
Very useful extension and much easier to work with than Searchbox Sync.
But it has some quirks. Some websites have default text in their search fields. Something like "Search..." or "Search our site". By default Conform Searchbox copies this garbage to Firefox searchbox each time website is opened. This problem has long solution, but I am not sure technically inexperience will be able to modify website's regular expressions that easily.
Options also may use some work. I would love to be able to sort websites.