Google Drive has an incompatibility with Mavericks, that can cause the Finder to intermittently relaunch, or the Finder to force itself to the foreground when working in an application. This behavior has been reported to begin sometimes days after Maverick’s initial installation.

Google updated their backend code on 11/5/13 to prevent this, but it requires that Google Drive be restarted for the update to be applied. More information is available at: https://productforums.google.com/forum/#!msg/drive/kqdqmoMWtk8/ajfw7JBt3FgJ