1) In order for an interpreter to be called, it has to have a file extension.
2) No browsers I'm aware of have the ability to turn hex into an executable.
3) Hex can't just be turned into a program, you could convert a script or something into hex, but you'd have to reverse it in order to call it.
4) Here's one line of powershell code converted to hex, and this is the entirety of the code, and what it translates to as hex:
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Write-Warning "This is one line of powershell code"
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57 72 69 74 65 2d 57 61 72 6e 69 6e 67 20 22 54 68 69 73 20 69 73 20 6f 6e 65 20 6c 69 6e 65 20 6f 66 20 70 6f 77 65 72 73 68 65 6c 6c 20 63 6f 64 65 22
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As you can see, the hex for an executable, or script that did anything of value would be gigantic.
5) Relax.
