Now, you don't need to add ss to Youtube url before you can download your favorite videos from Youtube, the introduction of an Add-on called Helper by SaveFrom.net will enable you to download videos from YouTube, Facebook, Vimeo, VK.com and more than 40 others websites with just a click, what you need to do is to install a browser extension called SaveFrom.net Helper in your device and the Add-on will integrate to your Browsers, like Google Chrome, Mozilla Firefox, Opera, Safari etc.
After the installation of SaveFrom.net Helper, you can easily download videos directly from embedded YouTube players in any website or from Youtube website itself by hover a cursor on appears "Download" button. Thereafter, you can save the video in the desired quality/format.
Simply download SaveFrom.net Helper extension here. The installation guide is at downloading page, just take note of it.