Imagine if your browser always operated in incognito mode, and also blocked all ads and web trackers on the internet. That's pretty much Firefox Focus, Mozilla's latest browser for iOS. Focus has just one tab that you can browse in. There are no bookmarks and the browser does not save history. When you are done browsing just hit the Erase button next to the address bar and it will purge everything that you have been doing. It also hides the contents of the browser from being visible when you are in the iOS multitasking menu. There is a button provided at the bottom should you...
Source: http://www.gsmarena.com/mozilla_releases_firefox_focus_for_ios-news-21702.php