If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.
View and manage downloads from a tidy statusbar
This is a new life in Firefox 26+ for old well-known addon Download Statusbar
New Features: Replace Downloads Library page.
Now you have full control of your downloads history!
A Statusbar with speed, percentage, time and loaded size (similar to Opera's one)
This restartless extension provides a separate downloads window.
View and manage downloads from a tidy statusbar - without the download window getting in the way of your web browsing.
Thanks Tekzilla for your awesome review! Click here to see their video: http://youtu.be/BUDqWrJ-Vao
This addon allows to automatically download from cache those elements that you have encountered while your internet daily-use