UPDATE: 11/1/22 I have been using the extension for may years (maybe 5?). Youtube breaks it sometimes, but Dishita always gives us a workaround until it can be fixed. He also always responds promptly if I contact him. I could not be happier with Youtube video Downloader!
UPDATE: 10/11/21 Yet another Youtube update that broke my favorite extension yet again. But not the fault of Dishita, the author of the extension, who fixed it promptly, as usual; within three days it was up and working again. LOVE this extension! Makes my online life so much easier! Can't speak highly enough of Dashita and his extension. When I emailed him to let him know it was broken, he emailed back right away to let me know what was going on, that it would take a few days for his new extension to be approved, and provided a link to the beta version if I wanted to try it. (I didn't.) Then, voila, the update popped up in 2 days and it works flawlessly yet again.
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UPDATE: 05/09/21: Sigh. Every time Firefox gets an update, YouTube breaks my FAVORITE all-time downloading app, Youtube Video Downloader. Fortunately, Dishita fixes it as promptly as possible, usually within a few days. As always, the delay is due to awaiting approval of the fix from Firefox. So, patience.
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update: 05/13/20 Just received new update. Still VERY happy with this add-on.
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2019 - I have been using Easy Youtube Video Downloader for at least a year, maybe longer, and have had no problems with it. It is indeed easy to use and is my preferred downloader. I have a Windows 10 system and use Mozilla as a browser.
UPDATE: I thought I was having trouble with this extension after the recent Firefox Quantum 67.0 update and posted a question for support. Support got back to me almost immediately and worked with me to resolve my issue--which turned out not to be an issue at all! I was trying to download a vimeo video, not a youtube video. Still the best youtube downloader out there, as far as I'm concerned. ALWAYS works for me and support is terrific.