All I ever wanted from Firefox 4.0 is the user interface latency (or rather, lack thereof) of Chromium and the process-per-tab / process-per-plugin model. The l

All I ever wanted from Firefox 4.0 is the user interface latency (or rather, lack thereof) of Chromium and the process-per-tab / process-per-plugin model. The latter would probably help a lot with the former. The screenshot mockups don't tell.