This is a brilliant app. Having moved from a Macbook Air with a touchpad, to a Mac Mini with a wireless mouse, this is a real game changer, being able to simulate trackpad gestures so intuitively. Especially the middle button trackpad simulation in Preview - works like a charm!

I'm still not able to get the Cmd+scroll-to-zoom feature working with Firefox, however. I've checked in the about:config section of Firefox and I can get Opt+scroll to work that way, but for some reason neither MMF nor Firefox's config seem to allow Cmd+scroll to register as zoom. I read a comment from the developer that said that version 3 would have a fix for Chrome (similar enough to Firefox?) whereby it wouldn't be necessary to add app-specific options for Chrome in order to get Cmd+scroll-to-zoom working. I tried both the 2.4 version and the current 3.0.5 version of MMF.

When Cmd-to-zoom is enabled in MMF, the effect that Cmd+scroll has in Firefox is to simply slow down the scroll speed significantly.

I've also tried entering every 'mousewheel.with' setting in about:config to 1 (normal scroll behaviour). Still no zoom with Cmd.
I did notice that setting each 'mousewheel.with' config to 0 (do nothing) will cause the Control key and the Option key (while scrolling) to successfully do nothing (no scrolling occurs). However, holding the Cmd key while scrolling still causes the page the scroll very slowly, the same as when 'mousewheel.with_meta.action' is set to 1. So it seems as though MMF is having an effect on Firefox, just not the expected one.

Anyone figure out how to get zoom to work with this in Firefox?