Note that if you updated to the previous version of Stylish (v2.1.1) which was released nearly two weeks ago, all your previous styles are saved, and you can easily access ALL of them (installed, edited and/or created). Just click on the “About this version” link at the top of the extension window. There you will be able to copy the CSS of any style that you had, and easily migrate it to the new version of Stylish. We apologize for the inconvenience and hope that after you migrate your styles you will enjoy the new version much more than the previous version.