This test release shows excellent promise. Currently firefox makes the rest of the desktop pretty unusable (on the sites you need it for, as opposed to ones that also work on NetSurf). Which means you are far better off turning on a PC as a second machine.
This version appears to have no more impact on the desktop than Kinoamp. (In fact it seems to have less impact than NetSurf) which means you can leave it chugging away in the background rendering awkward sites, while you write emails or even use NetSurf for plain HTML sites.
When this appears as a stable release, I think it will be the most significant improvent to date.