I believe this is an issue with Firefox itself, as it does it on various OS's, and on various hardware. I know how to get it work on a MacBook multi-touch touchpad running Ubuntu, so I'll show you how to do it there, and you should be able to get it to work on your touch screen as well, as it's a setting within Firefox, not the system.
Ok, open Firefox, and enter about:config
in the address bar, then in the filter box, put browser.gesture
, that will bring up all the touch gestures for Firefox. Once you have the touch settings showing, look for browser.gesture.pinch.in
and set the value to cmd_fullZoomReduce
, that should give you the zoom out, and to get the zoom in, look for browser.gesture.pinch.out
and set that value to cmd_fullZoomEnlarge
. Once you have those values set, there are 2 more settings you have to change. The next one you want to look for is browser.gesture.pinch.latched
by default it's set to true
you want to change that to false
, then go to browser.gesture.pinch.threshold
, which is set to 150
by default, you want to change that value to 10
.
That is how I got all the multi-touch features working for me, I hope it works for you as well, good luck.