Workaround for Fx 20+ (or 15+?) Rated 5 out of 5 stars

Before we get update from tdebaets, it is still possible to use this addon by making Firefox to use old download manager UI. Just switch: browser.download.useToolkitUI to true @ about:config page.

This review is for a previous version of the add-on (1.5.1-signed). 

Indeed, thanks for posting this helpful workaround :)