Extract video links from facebook.com via JS console of your browser

facebook_com_video_link.js

var page_content = document.documentElement.innerHTML;

var video_urls_encoded = /\"params\",\"[^\"]+(http.+\.mp4)/.exec(page_content);

var regex_unicode = /\\u([\d\w]{4})/gi;
var regex_unquote = /\\\//gi;
var match_counter = 1;
while ( match_counter < video_urls_encoded.length ) {

    var current_url = video_urls_encoded[ match_counter ];

    current_url = current_url.replace(regex_unicode, function (match, grp) {
        return String.fromCharCode(parseInt(grp, 16));
    } );
    current_url = decodeURIComponent(current_url);
    current_url = current_url.replace( regex_unquote, '/');

    console.log( current_url );

    match_counter++;
}