Some prefs have been reset to empty values.

You can check and change these prefs on the about:config page

browser.gesture.pinch.in cmd_fullZoomReduce
browser.gesture.pinch.in.shift cmd_fullZoomReset
browser.gesture.pinch.out cmd_fullZoomEnlarge
browser.gesture.pinch.out.shift cmd_fullZoomReset

See also:

• http://kb.mozillazine.org/about%3Aconfig

Thanks a lot cor-el, it works!

You're welcome

Thanks, your cheat with editing about:config worked here (winnt 6.2 with multitouch screen), but not to the full extent.

See, when I open Google Maps site in IE9, multitouch zoom actually zooms the map view -- when touched over the map itself. Outside the map, it zooms the web page as usual. Current firefox behavior lacks the smartness: it always zooms the page instead of the map, which is, well, not too handy :)

BTW in IE10 this is broken too.

Any setting for getting google maps work for zooming with firefox? (hope it wasn't an ie9-only hack on part of google maps:)

Thank you Cor-El,

Made an account just to say that additionally to what has been said, you can choose the incrementation of the zoom as well, if you want the zoom to be smoother.

about:config > Filter "zoom" > Do what Cor-El said > Look for the "toolkit.zoomManager.zoomValues" string; these values are coefficients to the original size of the webpage. Obviously, the fewer there are, the less smooth the zoom is. You can use an online list of numbers generator if you need.