Here is a pretty stable Chrome extension that allows you to download files directly to Dropbox.  It’s a great plugin, but it needs an option to change the download folder location. download to dropbox from Chrome Conveniently download straight into your Dropbox account.

How To Use It

It is quite simple to use.  If you wish to save to Dropbox and select Upload to Dropbox. The file will be automatically uploaded to your Dropbox account.