Currently, Opera software is the most popular mobile browser followed by the iPhone's Safari and Nokia's own browser in 2nd and 3rd places respectively. But if the action on desktop computers is any guide, mobile Firefox should do quite well. The desktop version of the software has just overtaken Interner Explorer 7 to be the most popular browser in the World with a share of 21.93%, compared with IE7's 21.2% The new mobile version will offer some of the features of the desktop model including tabbed browsing and a combination address/search bar. It will also be the first mobile browser to have "add-ons" that can provide functions like a news reader or other things that will, in effect, customize the phone in the same manner now done by downloading apps from an online "store" or "market". Sullivan says that one won't replace the other and that both the add-ons from the browser and app stores can peacefully "co-exist."