I’ve given a few links before to sites that allow you to download YouTube videos.
Well now I have another one to add to the list. This Script can be added to the toolbar of the Firefox web browser. When you see a video you want to save, click the button and then the page changes to allow you to save the file as an .mp4 video file.
All the instructions are on the page and it seems relatively straightforward. The thing to remember is to change the filename from .htm to .mp4 when you save it.
Obviously it goes without saying that you need to be aware that you may be infringing copyright by storing these clips – but this does provide a good workaround for those teachers who want to show a YouTube clip in a lesson where the school have blocked YouTube access.