Rated 4 out of 5 stars

i figured out transparent background of cells via stylishg CSS...here is the code; /* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: * ::: Created by Hasan Yılmaz a.k.a. SuPeRHeRo ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */@-moz-document url("chrome://speeddial/content/speeddial.xul"){.thumbnail{ opacity: 0.3 !important; margin: 2px !important;}.thumbnail:hover { opacity: 1 !important; }.speeddial-container { background-color: transparent !important; border-width: 5px !important; -moz-border-radius: 15px !important; border-color: #bbaeee !important; }.thumbnail-title,.speeddial-top-middle,.speeddial-bottom-middle,.speeddial-top-middle,.speeddial-middle-left,.speeddial-middle-right,.speeddial-bottom-middle,.speeddial-top-left,.speeddial-top-right,.speeddial-bottom-left,.speeddial-bottom-right{display: none;}}

This review is for a previous version of the add-on (0.9.5.8.1-signed).  This user has other reviews of this add-on.