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The JavaScript that arrives at the browser is usually not source code in the way that licenses tend to define the term (which is the preferred form for modifying the program). It's usually at least minified.

It's kind of an interesting situation since it looks like source code even though it really isn't.

Looking at the source code of nonfree Javascript is not recommended. You could be sued if you happen to write something similar and can't claim anymore that you invented it independently ("white-room").

That's not really true - most JavaScript is minified and a lot is obfuscated.

And a lot is transpiled from another language. I'd say very few major sites send you readable hand written JavaScript.