It's much easier to use VideoCacheView and let it recover all the videos you've watched online for you. This program analyzes your web browser's cache (from both Internet Explorer and Firefox) and extracts all the video files stored in it. You can then watch them again, as long as you have the right player. What's more, the program also includes a link to download the file to your hard drive.
VideoCacheView is great to review videos you specially enjoyed, but it does have some limitations: for example, videos are not always stored in cache while you play them online, which means VideoCacheView won't be able to recover them. Also, if you want to access the latest videos you've watched, you'll have to close the web browser.
Download VideoCacheView 1.82 in Softonic