Extra caution is recommended when installing recently uploaded/updated scripts (read more)
Be sure you trust any scripts you install
Yahoo! Mail Mailto Anywhere...
Force mailto links to open with Yahoo! Mail
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some websites use %40 instead of '@' when they encode mailtos, so i would change the hasMail= line to:
hasMail = Math.max(thisLink.href.indexOf('%40'), thisLink.href.indexOf('@'));