The latest Firefox 4.0 Beta 2 pre brings a long awaited feature: app tabs. This feature is very similar to the "Pin tab" option in Chrome: the app tabs use only favicons for the tabs and all the links you open from an app tab are opened to the right of all the app tabs.
Alex Faaborg: "In the Firefox 4 nightly builds, and in Firefox 4 Beta 1, we are changing the default tab position so that tabs are on top. This is a preference that users can change by right clicking on any of their toolbars."
Mozilla Lab's Firefox Home app has cleared Apple's approval process and is now available for free in the App Store. The app uses Firefox Sync to import browser history, tabs, and the Awesome Bar, bringing a truncated version of the Firefox experience to the iPhone and iPod Touch.