1 How to download funny and amazing Facebook videos

How to download funny and amazing Facebook videos ? this is a common question between from all facebook users Here im describing a simple and nice tool ( mozilla firefox addon) for this purpose,you must installed mozilla firefox for downloading  videos form facebook and  youtube,   
Step 1) Open Mozilla firefox and go to https://addons.mozilla.org/en-US/firefox/addon/download-youtube-videos/
Step 2) Click on The Add to Fire fox button,after installing that you must close and re open mozilla 
Step 3 ) You can see a extra toolbar in your browser,now go to any facebook video or youtube video and  just play that video..