You get a desktop notification while your downloading finished.
This extension does two things:
1. Disabled the download shelf. Yes, I personally do not like it. So when I get the change, I just disabled it. You will get a badge while something is downloading. Sorry no progress bar available for now.
2. Display a desktop notification when your downloading finished, and you could find it by one simple click.
TODO(May be implemented in future, may not):
1. An animated browser action icon which could show the downloading progress
2. A "OPEN" button on the notification card -- depends on whether Google would allow me to do so.
3. A popup shows all the downloads -- actually it was almost there, if there had not been some annoying bugs.