Hi, I'm the creator of Zoomii. I've been (mostly) lurking on Hacker News for some time now.

Thanks for the feedback. It is very slow on FF3 right now, due I think to its slow scaled-image rendering and tossing of uncompressed image data whenever leaving the tab. But it looks like using a CANVAS will actually make FF3 the fastest browser for Zoomii. Working on it. Hope to deploy that today.