I recently updated my OS X to 10.8.4 and updated Firefox to 23.0.1 Now the pinch zoom feature on my trackpad does not work. It works fine in Safari. Will appreciate any suggestions to solve this problem.
You can restore the zoom feature by changing the values of the related 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 browser.gesture.pinch.latched -> false
Well, the specious answer would be "Use Safari", but that's clearly not very helpful.
I doubt very much that the OS update you mention made a difference, although for peace of mind you might like to step your upgrade to see where the fault was introduced. If you can revert to your previous version of Firefox whilst keeping on 10.8.4 and see if that still works, then you'll know the problem is localised to the new Firefox version.