- Open Firefox and search for about:config.
- Right-click in an empty space and go to New > String.
- Name it general.useragent.override and then put this code there:
Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) FxiOS/1.0 Mobile/12F69 Safari/600.1.4
- Open a new tab and find the YouTube video you want to download.
- Start the video and let it play for a few seconds. If there’s an ad, let that finish first.
- Right-click the video and choose Inspect Element.
- In the new window that opens, find <div id=”player” and click the arrow to its left to expand it, and then do the same for <div id=”movie_player” below it, and <div class=”html5-video-container” below that.
- Below that is a long URL following src=”. Double-click that to see the full URL, right-click it, and then choose Copy.
- Open a new tab in Firefox (or any browser) and enter that into the navigation bar.
- Right-click the video in that tab and choose Save Video As.
- Download videoplayback.mp4 to your computer to save the YouTube video. You can rename it if you want.
- Return to the tab with the user agent setting, right-click the new string you made, and select Reset to return Firefox to desktop mode.
If inspecting the video page doesn’t show a download link, try the user agent setting in firefox as we did above, and then give it another shot. You might also have luck using a different browser like Chrome or Edge.