remove legacy codes for Firefox 3.5
fix: [Nightly22.0a1] cannot access |event.view.top| directly
ver.1.6.22
fix: 'View Image' and 'Save Image' command don't work with Firefox 20 due to conflict with some add-ons
ver.1.6.23
use 'openLinkIn' to open link in window or tab
add 'New Private Window' and 'Open Link in Private Window' command
drop support for Firefox 17 or older in locale files
clean up status display codes
add 'Swipe Gesture' feature
add 'Mouse gesture with continuous swipes' option
locale updates
ver.1.7
[Mac] fix error when scrolling mouse wheel on popup
clean up codes
fix: mouse gesture fires incorrectly in Tilt 3D View
add 'Web Developer - Toggle Tools' command
improve 'Go Upper Level' command for about: URL
improve 'Go Upper Level' command for root URL
stop using deprecated 'for each...in' statement