Muerto: Right click on any text field, and you can make your own quick search equivalent. For instance, I went to PHP.net, right clicked on the search box in the upper right, and made a quick search with the abbreviation "php". So now when I want to check out the API, I can just type "php preg_match" in my address bar, etc.

You can modify the tabs to resemble firefox by going to Preferences->Advanced->Tabs->"Show close button on each tab". (And of course the tab bar can be dragged around the screen by right clicking on it, selecting "Customize", and changing the "Placement:" setting. (Affects highlighted UI piece only.)