I just received this message from Firefox when I went over to my Twitter account... wondering why they are correcting this now. Important information for Firefox users We recently learned that the way Mozilla Firefox stores cached data from Twitter may have resulted in non-public information being inadvertently stored in the browser's cache. For example, if you downloaded your data using Firefox, the browser may have retained a copy of the download for a period of time. We have made changes to prevent this from happening again. For more information please see this post. If you have any questions or concerns regarding this incident, you can contact Twitter’s Data Protection Officer by completing this online form.