fix #41: popup has no drop shadow on Windows 8
add icon64.png
ver.1.2.1
use consumeoutsideclicks attribute
unprefix some css3 properties
remove Windows 7 Aero Glass support
make the popup flat-style
add 'Popup fade-in' option
show URL in tooltip of title
use Element.mozMatchesSelector
[TreeStyleTab] lower the position of popup for pinned tab
[Linux] force to disable fade-in option