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You could just encrypt the text going over the “wire” things like a one time pad would likely be incredibly effective for most.

There used to be a website which would allow you to encrypt and decrypt data.

I was expecting some kind of Firefox addon to implement this kind of encryption to regular messaging websites

There are browser addons for pgp, for example. However none have gained big popularity.

It's a failure of browsers not to include identity/key management beyond usernames and passwords

I believe PassKeys are fixing that.