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Videos in websites have no sound in firefox for Android.

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Audio does not work on any video, whether YouTube or videos embedded in a website. Firefox for Android version 62.0.3, Android 5.0.1

Audio does not work on any video, whether YouTube or videos embedded in a website. Firefox for Android version 62.0.3, Android 5.0.1

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I realised I ought to see if a video in an online course I was trying to follow worked in the stock browser (Google Chrome); after a bit of crackling it did. When I retried it in Firefox, bingo! It worked. I wonder if the problem is/was with the tablet itself. Problem solved, but Heaven knows why or how. Now I can follow the course either on PC or tablet easily.