After updating Mac OS X to Mountain Lion, many users found that “Activity Windows” was removed from the latest version Safari 6. The “Activity Windows” makes it possible for YouTube fans to download favorite YouTube videos in FLV format with Safari on Mac OS X. Now, the feature was gone which disappointed many Mountain Lion users.
The Fix to Download YouTube videos in Safari 6 on Mountain Lion
Then, is there no way to download YouTube videos in Safari 6 on Mountain Lion?
The question is absolutely yes. After installing free Safari Extension, you can start download YouTube videos in FLV/Flash with Safari on Mountain Lion like usual.