Email Extractor is a browser extension that lives in your toolbar and:
1. Scans any page you visit;
2. Finds all email addresses (including those hidden in the source code);
3. Saves them together with the source URL;
4. In the end, you get a consolidated list ready for export in CSV, JSON and TXT.
I designed the tool from the start so that I could honestly say: built with respect for your privacy, no data is stored.