TechCrunch is reporting that the YouTube.com’s new design will be enabled to all users soon. This experimental layout is currently served to many users randomly, and the video page overhaul is the biggest redesigns in YouTube’s history.
Of course, this new design has many new eye-catching features like a brand new sidebar, but I have discovered one serious problem with it: Almost all Firefox add-ons (and greasemonkey scripts) to download YouTube videos in FLV, MP4, HD formats are not working on the new video page. According to developer Gantt, who maintains popular userscript "Download YouTube videos As MP4", the new layout is very complicated for add-on developers. He says:
Changing the script for the new layout is quite complicated because YouTube uses a lot of Ajax and I couldn’t find a way to inject the script when you open a new video. [ … ]
How To Download YouTube Videos Now?
Thankfully, there are several other hacks to download YouTube videos. I am not very sure if other ways would be affected with the new design changes. One easiest option is KeepVid.com’s bookmarklet. Let’s hope it would continue to work.