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Thanks to a Mozilla Firefox extension, it is a simple and quick job to download the video of your choice from YouTube. If you don’t use Firefox you should nevertheless have it installed to take advantage of the beneficial functions many of the plugins bring to your browser.
In Firefox, go to Tools > Add Ons and using the search function type “youtube” – the resulting list should include "Easy YouTube Video Downloader," Select this to download, and restart Firefox at the prompt.
Once Firefox is restarted, browse to YouTube and find the video you want to save. You’ll notice on the right-hand side of the video play area there is a new link, just below the embed function, labeled "Download as MP4". Click this link, and download to a location of your choice. You now have a copy of the YouTube movie in MP4 format!