Some videos are so good, you need to see them offline, but YouTube, Vimeo and Facebook don't offer the download button for videos. You are only allowed to embed and share the videos. To download Facebook, Vimeo and YouTube videos, you need to visit this website.
Downvids.net allows you to download Youtube, Facebook and Vimeo video with a click
How To Download With Downvids
Go to the website of the video you want to download
Copy the URL link of the video of either the YouTube, Vimeo and Facebook you want to download and paste inside the URL textbox of Downvids
Click on download this video (Right Click and Save As)
If it is a YouTube video, it automatically starts downloading.
Vimeo and Facebook video will open a new tab on your browser with the video, right click on the video and you will see "Save Video As"
The video will be downloaded into your specified computer on your computer.