Installerte Firefox 20.0 forleden. Likte ikke den nye download manageren /vinduet.

Googlet og fant følgende oppskrift for å få tidligere utseende og funksjonalitet tilbake:

If you don't like this new download manager and want to switch back
to old one, you can use following steps:

1. Open Firefox and type about:config in the addressbar and press Enter.
It'll confirm, click on I'll be careful, I promise! button.

2. Now type ToolkitUI in the Filter box and look for following boolean
key:

browser.download.useToolkitUI

3. The entry "browser.download.useToolkitUI" would be set to false.
Double-click on it or right-click on it and select "Toggle". It'll set
its value to true.

4. That's it. Now you'll be able to enjoy the classic download manager
in a separate window instead of the new one.