Firefox might have lost some of its mind share to Google Chrome (see: 15 Best Chrome Extensions), but the fox from Mozilla continues to fight back. As evidenced by the addition to the Firefox 4 Beta, which became available for download back in June, of multi-touch support.
As the video above demonstrates, the functionality is potentially very powerful, particularly when used in conjunction with HTML5. It's still up to website designers to create pages that support such touch operation, however, so if you've got a multi-touch all-in-one PC then the Firefox 4 Beta won't suddenly transform your web experience.
At present it's also limited to Windows 7 users; Mac users are denied. This may seem odd considering Apple's advocacy of multi-touch, as seen in the Magic Trackpad. However, unlike Macs where multi-touch is limited to the touchpad, there are many touchscreen Windows PCs and Windows 7 does support multi-touch, making the decision less insane than you might initially think.