Of coarse many software n mozilla plugins are available so google it down or check the below link for beyond youtube stuff http://www.makeuseof.com/tag/18-free-ways-to-download-any-video-off-the-internet/
Replace with voobys ex:- before replacement: http://www.youtube.com/watch?v=gyQbaDxqZ3g&feature=featured after replacement : http://www.voobys.com/watch?v=gyQbaDxqZ3g&feature=featured
prefix "kiss" to liknk ex:- before prefix : http://www.youtube.com/watch?v=gyQbaDxqZ3g&feature=featured after prefix : http://www.kissyoutube.com/watch?v=gyQbaDxqZ3g&feature=featured