Firefox for Android to Get an Overhaul with Native UI
Mozilla's director of engineering Jonathan Nightingale has informed the Firefox community that future versions of Firefox for Android will get a native UI instead of the current XUL-based interface.
According to Nightingale, the native UI will allow Firefox to achieve better startup times, reduce memory consumption and become much more responsive. The mobile browser has been heavily criticized for its generous memory consumption and slow startup in the past.
Of course, this change will ring in another round of discussions that will center around add-on support. Nightingale said that the change to a native UI is still in its early days and there are talks with the Add-on SDK team how support extensions. While this could be another painful switch for developers, Mozilla stresses that its discussions are open and that it welcomes participation from the community.
There is no information when the new UI will be available. According to Nightingale, Firefox 8 and 9 will still ship with the XUL and tablet UI.

Its easier to port xul.os and have the massive overhead than rewrite the browser from scratch. Most of Firefox is written in C++, so it can cross compile alot of its dynamic libraries into Android. It will take a LOT of work to rewrite xul for minimum memory footprint, the file is about 25 megabytes on Windows. Its a lot of code, and it is the vast majority of Firefox's code base.
As it is, Dolphin HD is an excellent browser. It's fast, supports flash and it even has a smaller version that is even lighter for those with less powerful droids.
Firefox is behind the eight-ball on this one.
My Thrive crashes on www.seekingalpha.com . Can't seem to get a browser that won't crash the tablet in that website, although my Samsung Galaxy s2 phone has no problems.
I absolutely agree with you isamuelson.. Dolphin HD is blowing away the competition right now. If you haven't tried it you should. I prefer the tabbed browsing style to the regular browser.