Funny you should mention that. It is the top thread right now on the dev-gaia mailing list.
https://groups.google.com/forum/#!topic/mozilla.dev.gaia/QP7...
https://groups.google.com/forum/#!topic/mozilla.dev.gaia/QP7...
The GP complains about being _required_ to scroll to the top to reach the address bar/the tabs, which is plain wrong (but might be a case of bad discoverability?).