How to download videos from facebook or vimeo (or youtube or any other service)

I hate long "how to" videos.
So here are my versions of how to easily save videos using just a web browser


Facebook video download steps:
1)open video page
2)change to mobile version
3)play the video and save it using right mouse button option


Vimeo (youtube and many more service) download steps
1)copy the video link
2)paste it in some service (keepvid or ssyoutube or savefrom.net)
3)download it