Apple: How come Dropbox gets an icon in Finder sidebar?

How come Dropbox gets an icon in Finder sidebar?
Hey guys! Hopefully you found a solution that helped you!
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Thanks to all the great people for their contributions!
(apple.stackexchange.com/users/35504/baumr)Baumr
(apple.stackexchange.com/users/30981/jmk)jmk
(apple.stackexchange.com/users/59585/doovers)doovers
(apple.stackexchange.com/users/62635/tech-one)Tech One
(apple.stackexchange.com/users/18667/nickolay-olshevsky)Nickolay Olshevsky
(apple.stackexchange.com/users/83620/sassan)Sassan
A special thanks goes out to the awesome (apple.stackexchange.com/questions/83152/how-come-dropbox-gets-an-icon-in-finder-sidebar)Stackexchange community
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google-apps icon folders dropbox finder