To be fair, you don't need to click around with Firefox's search bar. If you create a bookmark with a keyword, then typing the keyword on the main bar loads the website, and if you put an %s somewhere in that bookmark's url, you can then use it much like a bang, e.g.
newegg ATI HD4200
That said, I can perfectly understand why you don't want to waste the time to set them up if someone has already done it for you.
And then you can't re-target (or fix a typo) in the same query in the same place, since the address bar will be replaced with the address of the loaded site. That's why I use the separate search bar.
