Judging by the images posted by Ian Barlow, the UI is much closer to Firefox for Android than to the desktop version of Firefox.
The tablet version will include two modes - a portrait and a landscape mode. The landscape mode will move the open tabs in thumbnail view to the left of the screen to take advantage of widescreen layouts. In portrait mode, there will be only one tab icon that shows the number of available tabs and enables access to them via a drop-down menu.
The overall design takes a very minimalistic approach. The menu bar only includes the back, forward and reload buttons, as well as the URL bar and a menu item on the very right that will include commands such as new tab, find, share, and settings. There is not even a Firefox icon in the new single-line menu bar.
First shown in early June, the Firefox tablet interface, which was originally known as "Fennecomb" (to indicate a Fennec (Firefox Mobile) browser for Android Honeycomb), has matured in less than three months. The UI is scheduled to debut with Firefox 8.