Email Finder от Jonathan Moore

For every page you visit, this extension will extract all the emails visible on the page and show them in a banner at the top of the page. It will also add those collected emails to a running list of emails which you can access by pressing the toolbar button. This list will aggregate, sort, and store the emails you see as you navigate through different pages.

Sometimes, emails will appear on the page after the initial page load. To grab these as well, single click anywhere on the page to regenerate the banner (and add the newly found emails to the running aggregate list).

You likely will only want to see the banner when actively looking for emails; it's recommended to disable the extension whenever you're not using it.