As mentioned before, you can download flash videos in any webpage on Chrome with these 4 steps, without installing any extensions.
But it will be more easy for you to download online flash videos by installing the FREE Chrome extension FVD Video Downloader.
After installation, in the Chrome toolbar, you can see a grey download icon (with a red "X" symbol) , which will turn blue when there are flash videos in the current webpage. Clicking the blue icon, you can see all the detected flash videos and download them one by one, as what you can see from the above image. Easily, right?
Besides flash, the FVD Video Downloader extension is also available for you to download FLV and MP4 files from Break, DailyMotion, Metacafe and some other video sharing websites, but not YouTube or Hulu at least.