Nhentai Operators Ordered to Expose Themselves in U.S. Copyright Lawsuit

Phrasing!

mp4 is not really a video format. Depending on how recent they are they’ll play a broader or narrower range of MP4 files, depending on codec selection.

What you read is true, and also total nonsense.

There is not too much point in discussing privacy and security without a threat model.

So once you put your threat model into focus, you can discuss how to mitigate those threats and pick the right browser for you.