remove dev tool
turn off debug mode
add debugging tool for js snapshot
conquer z-index war
add references
add prefix on dom elements we made to avoid conflict
add prefix on dom elements we made to avoid conflict
keep extension runs in background persistently to support native snapshot
add style file
add functionality of whole-page snapshot which is utilized by chrome native method
add hotkeys for two kinds of snapshot method
remove nested function declaration
add tool set for make whole page snapshot with browser native method.
support js/native snapshot at the same time with different hotkeys
fix size configuration