On the site Youtube, open the address bar of the browser on which the video is located and click copy in the context menu or press Ctrl+C / CMD+C. In the application, find the share button and then copy the link.
Click paste the copied link into the form FetchFile
Select the desired video format and click "Download" or "Save to Dropbox".
Just drag the button below to your bookmarks bar:
A new bookmark will be added to your browser. Whenever you want to download a video, such as from YouTube or any other supported website, just click on the bookmark to view the available links to download your video.
Using the FetchFile bookmarklet, you can quickly and easily download videos from all supported websites on the go.
All desktop browsers are supported.