The item "Dropbox" could not be moved to the trash...

[Bren]

...because some of its extensions are still in use.

How do I get rid of this thing? I told Dropbox not to launch on startup, and I de-linked this Mac from Dropbox, yet, even after a restart, I am still unable to delete the app.

Please help, please. Thank you.

[Betonhaus]

Force quit the Dropbox app in Activity Monitor

[Bren]

Thank you, that fixed it.