Thanks Rajat and Piet Hein for your solutions!
Dropbox integrates with Finder in order to help you share files easily or display the sync status on the overlaying icons 🙂
Indeed, in your activity monitor, you should be able to look for every Dropbox instances and Quit/Force Quit them.
If you can't force quit "Dropbox Finder Integration" and you're running Yosemite 10.10.0, you can disable it manually.
Click on the Dropbox icon in your menu bar, then click on the gear icon and go to Preferences.
On the General tab of this preferences panel, you'll be able to untick and disable the integration.
You can read more about this here:https://help.dropbox.com/desktop-web/finder-integration-yosemite
I hope this helps!
I'm having this problem and none of these solutions are helping at all! I'm on a macbook air OS X and I've thrown all of dropbox in the trash, but it won't let me empty it because the item 'dropbox' is apparently still in use. Even though I've removed it from everywhere, it's not open or functioning anywhere that I can find and the activity monitor can't pick up any dropbox activity on my computer at all! So why can't I delete it?
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