As promised, Mozilla, the open-source organization behind the Firefox browser, has just released Firefox 4, the next major iteration of the popular browser. The 27 MB download is available in over 80 languages on Windows, Mac OS X and Linux. Firefox 4  features an optimized JavaScript engine that makes web apps run noticeably faster, with GPU-accelerated page rendering. The browser comes with a new look user interface. There’s a a dedicated bookmark button right next to the search filed.

The tab bar is placed atop the address bar (you can also revert this setting), resulting in a more polished, cleaner appearance. If you’re like me, you keep dozens of tabs open as you scrub through your favorite websites. This quickly adds up to the confusion as sorting through tabs becomes an increasingly tedious affair. Luckily, more controls are now available to manage your tabs.


A new button in the upper right corner next to the address bar launches a brand new tabs management interface called Panorama. If the icon is missing, customize your Navigation Toolbar by dragging the Tab Groups icon on the Firefox toolbar area. Panorama lets you group tabs by dragging their thumbnails around, save and rename groups, tuck them away, and peek inside stacks. You can also pin tabs to prevent accidental closing, search through open tabs right from the address bar and more. It’s a welcome addition that the fans of heavy tabbed browsing will undoubtedly love, especially those multitasking on several projects at once.

Expanded privacy controls are available in the Options menu, allowing you to fine tune which web sites are allowed to use tracking cookies. Firefox’s add-ons manager has been re-worked and Firefox Sync is now part of the browser rather than an optional add-on. Firefox Sync is Mozilla’s technology that keeps your browser settings, bookmarks, history, passwords and other data synchronized across desktop and mobile devices running Firefox.

Firefox Release candidate for Maemo and Android is also available for download. Also worth mentioning, Windows and Linux versions of Firefox 4 remove the menu bar and put frequently used options under the new orange Firefox button in the upper left corner of the window. You can re-enable the regular menu bar anytime in settings.

FTC: We use income earning auto affiliate links. More.

Check out 9to5Mac on YouTube for more Apple news:

You’re reading 9to5Mac — experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Don’t know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel

About the Author