At some point way back in the past, I set up some utility to intercept mailto: links in web pages and have Chrome compose a message in Gmail rather than having it open the Apple Mail app.
Now, I'm trying to remove it and have Apple Mail open mailto: links, but I can't figure out the utility I used to intercept them.
I thought it might have been Webmailer, but I checked System Preferences, and it's not in there. Also, I looked in my Chrome and Safari extensions, and no extensions that are currently installed have anything to do with redirecting mailto: links. Though it may have been a browser extension I installed and later removed.
I'm on Mac OS 10.7.5