In Version 15, you open a new tab by tapping the “1” on the upper-right corner of the main browsing window, and then the “+” on the upper-right corner. The app switches to the screen that lists Top Sites, Bookmarks and History. Along the top is the URL entry box, and your Android phone’s virtual keyboard pulls up. Type the URL of the page you want to visit, or find and tap its link listed under one of the three categories. The page will load, and on the main browsing screen, the “1” is replaced with a “2.” Tap this number and you’ll be presented with thumbnails representing the two tabs that are active on Firefox.