@taichi_kato I think "NoMailTo" or "eMailTo:Clipboard" extension is slightly better in terms of functionality. It also seems abandoned, you might want to adapt the functionality (if you want).
Since you are using mac, I'll let you on a secret — on Windows, NOBODY wants their default mail app to open. Therefore ability to copy email to clipboard is desirable.
Lastly, you probably want to include the word "mailto" in your chrome extension description. Some people do search specifically for that term and it exactly what is your extension dealing with.
Cheers!
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