Awesome Firefox Plugin for Faster Downloads and Pause Support
Normally Firefox does not support pausing and resuming the videos. Also while using default download functionality of Firefox, if you need to lose the connection or need to change the connection, you download progress loses and you have to restart the download once internet is back.
Down Them All not only gives you faster downloading experience by downloading the files in many parts on same time and joining them once download is finished but also it gives you option to download part of file, pause it and come back later to download remaining part.