If you go to the BottomFeeder download page, and then scroll down to the dev links, you'll have access to the latest build - pushed up just minutes ago. There's already an update available - it ties history to the tabs (as in Firefox). To get that, add 'dev' to the end of the update path in settings and then restart.
The 4.0 release is pretty close now - Rich has been good about finding inconsistencies and issues, and I've been fixing them as they come up. The doc is also progressing - the release should be soon.