what the "ehrn" is in "viewable by the public ehrn putting in someone's email address in browser".

In fact, I'm not sure I understand your question at all.

You can use your own web browser's options, (usually in Tools > Options), to control web browsing history, or you can use a specialised cleaner like CCleaner. Is that what you mean?

By the way, this Forum Feedback forum is not the best place to ask questions. It is for feedback on forum problems or other forum matters. Perhaps the Browser's forum here would have been a better forum to ask your question.

Mark