I’ve been testing out a Windows build of mozilla/browser. It has a number of usability improvements, including a return to having the URL entry box in its own separate toolbar, simplified menus, a slightly improved reload icon, and easier access to history. Check Blogzilla for screen shots and additional information. It’s clear that it needs a lot of polish, but it is somewhat better than Mozilla, if only because of the URL bar change. Update: If you download the build, make sure you launch it with mozilla.exe -chrome chrome://browser/content/
or you will not see any differences.
Trying to search Google for more information about mozilla/browser (or even mb) yields less than useful results. It makes me wish this project had a more interesting name.