Mac Trackpad zoom in Firefox 4

Firefox 4 disables zoom with trackpad in mac osx.

To enable pinch/zoom in Firefox:

  • Open a new tab.
  • Type in about:config and press Enter.
  • In the search pane, type pinch and press Enter.
  • Enter these values for the and pinch.out prefs:         cmd_fullZoomReduce   cmd_fullZoomReset
  browser.gesture.pinch.out        cmd_fullZoomEnlarge
  browser.gesture.pinch.out.shift  cmd_fullZoomReset
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