In Chrome’s inspector, with JavaScript disabled, I see the mailto links as though they’re not encoded. However, looking at the raw page output (ctrl-u) in Chrome shows that the links are indeed encoded. Chrome’s inspector must decode the HTML codes automatically.
Use ctrl-u to see the actual raw html output to verify that this plugin is working, not the browser’s HTML inspector.
that means it is not hiding it and to hide them I would need to buy the paid version:
The Premium version supports full-page parsing and finds and protects all email addresses. It also supports CSS and JavaScript-based techniques to against smart robots.