Go to Firefox
Add on for Video Download Helper can be found here and it needs to be installed
Click on Install on Firefox
Click Add to Firefox
Then locate the Video Download Helper multi color icon in the upper right corner of the window> Click on it
Choose what size file to download >
Try to find the biggest choice so your quality is best
The next window will ask where you want to save the downloaded file.
Done you have a file to use in AVID or any other Editing application.