Comment 2 for bug 746756

also for firefox you should change these wishes
    <wish gesture="Drag" fingers="2">
      <action name="action5" when="update">
        <trigger prop="delta y" min="20" max="80"/>
        <key>Page_Up</key>
      </action>
    </wish>
    <wish gesture="Drag" fingers="2">
      <action name="action6" when="update">
        <trigger prop="delta y" min="-80" max="-20"/>
        <key>Page_Down</key>
      </action>
to something like this
    <wish gesture="Drag" fingers="2">
      <action name="action5" when="update">
        <trigger prop="delta y" min="20" max="80"/>
        <button>4</button>
      </action>
    </wish>
    <wish gesture="Drag" fingers="2">
      <action name="action6" when="update">
        <trigger prop="delta y" min="-80" max="-20"/>
        <button>5</button>
      </action>
    </wish>

because page up and page down key move too fast!