how to download Facebook videos ? working solution

I recently wanted to download a video posted on Facebook when i googled i stumbled across many links on how to download youtube videos but most of the technique or tips such as scripts, extensions and tools i found was either obsolete or not working for some reason and was very complicated which requires accessing third party websites etc and after a a lot of tries and using addons i found few methods/tools which indeed helped me in downloading the Facebook video clips directly instead of redirects and complicated methods, so thought of sharing these tips i found with you guys

Video Download Helper
If you are using Mozilla firefox then Downloader Helper is a must have tool this extension is developed by third party you can find it in the Mozilla official website deck and can be installed depending on your mozilla firefox version.

Download helper not only rips facebook videos but can download videos from various social networking and web portals such as youtube, vimeo, personal sites, and other organizational websites.

Once the addon is installed and firefox is restarted if the webpage contains any video played the download helper icon near address bar automatically start animating and when you click on the drop down list you can see the list of downloadable video's as shown in below pic.

Firefox and Google Chrome Cache viewer

This is being my favourite type of video rip off trick, from last few years now this trick allows to download almost 90% of videos and audios found on the net, the trick is browsers always download a copy of videos into its cache because if user replays video it does not want to download again from the net this comes very handy because browsers save this downloaded video in form of cache until a specified amount of time say few hours to a day, there are lot of cache viewer plugins and tools that can view and download this content from cache such as audio, video, image, documents etc from browsers such as Firefox, chrome, Internet Explorer, Safari, Opera etc, below is the pic of cache viewer of mozilla firefox

you can install this cache viewer as an addon or download it Here seperately for a specific browser.

Though there are many other tricks to download video from Facebook and other website's such as giving link in some portals and running grease monkey scripts from Firefox i found above two techniques to be easy and non complicated if you know any other easy way of doing do let me know.