Tab to complete in search bar
One thing that's missing from all browsers except Chrome is the ability to begin typing in the search bar and then hit tab to complete the domain of a website. For example, if I want to search on Google, but my default search engine is Duck Duck Go, I currently need to type g + space then search. Rather, I could simply type g + tab and then the search query. I know this seems trivial but from a UX standpoint, it's quite amazing. Furthermore, you don't have to predefine shortcuts in the settings. So if I haven't specified youtube, but it's the most highly visited site that begins with y, i could simply type y + tab and then search directly on YouTube. Here are some examples: http://inft.ly/AbiAyix (before tabbing) and http://inft.ly/qCxMAAN (after tabbing).