Download videos in ubuntu just like IDM in win7

"DownloadHelper" is one of the most useful mozilla browsers add-on for video download. I have use this to download videos from web. After download the add-on and install you should follow the steps to download video:
1. Video DownloadHelper icon in your toolbar like the image.


3. Just start a video and click on the little arrow to choose the desired video.

"DownloadThemAll" is another add-on like this and you can use this too.
Xtrem download manage is one of most popular download manager in Ubuntu. In bellow explain how to install xtrem in ubuntu.
wget -O xdman.zip http://sourceforge.net/projects/xdman/files/xdman.zip/download
Extract xdman.zip:
mkdir xdman
unzip xdman.zip -d xdman/
Enter to directory xdman/ and make exexutable file xdman.sh:
cd xdman/
chmod +x xdman.sh
To run:
./xdman.sh
Or you can install xtrem by this instructions:
sudo add-apt-repository ppa:noobslab/apps
sudo apt-get update
sudo apt-get install xdman
To run:
sudo xdman
download file now