It's a web browser, it was added to the list of default browsers as part of a feature request a while ago: http://youtrack.jetbrains.com/issue/WEB-12221 . As you might've noticed, it's not enabled by default.
Please check what settings you have in Preferences/Settings | Tools | Web Browsers (see http://jetbrains.com/help/webstorm/settings-tools-web-browsers.html … for more info). It's possible that Chrome Canary is set as the default browser.
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