请教如何从油管下video

以前用一下叫youtube HD video downloader的冬冬，现在不好使了。试了如下链接：
http://youtu.be/UxxajLWwzqY

所有跟帖： 

• google youtube downloader -大大V- ♂ (0 bytes) () 10/22/2013 postreply 14:31:02

• 下载downloadhelper插件,很好用 -mywen- ♂ (0 bytes) () 10/22/2013 postreply 15:10:22

• 如果你装了Java Runtime，直接去 http://keepvid.com/ 就好了 -foobar- ♂ (106 bytes) () 10/22/2013 postreply 15:38:54

• www.ilivid.com -奉旨灌水- ♀ (0 bytes) () 10/22/2013 postreply 17:44:22

• 多谢各位！ilivid works very well! -GuoLuke2- ♂ (0 bytes) () 10/22/2013 postreply 20:05:08

• Did you have to install Ask Movie Toolbar? -LAChinese- ♂ (107 bytes) () 10/22/2013 postreply 22:53:47

• 我安装时把所有checkbox都uncheck了。 -GuoLuke2- ♂ (0 bytes) () 10/23/2013 postreply 10:40:34

• firefox -cecillia- ♀ (0 bytes) () 10/22/2013 postreply 20:20:57