Firefox swiftly incorporates new features, such as tabbed browsing, that have now become ubiquitous.

FORBES: Magazine Article

Firefox was first to popularize tabbed browsing and first to integrate pop-up blocking, spell checking and antiphishing into the browser.

FORBES: Magazine Article

We also didn't like that tabbed browsing now requires two taps to get to another page, unlike the previous version, but we imagine that was needed for the increased speed.

ENGADGET: Native Firefox Android browser adds speed, Flash, HTML5 and a fresh look (hands-on)

Also, full tabbed browsing in Safari.

FORBES: Apple: Live From The WWDC; OSX Lion, iOS 5; iCloud