.devtools-option-toolbarbutton {
list-style-image: url("chrome://browser/skin/devtools/option-icon.png");
-moz-image-region: rect(0px 16px 16px 0px);
.devtools-option-toolbarbutton {
list-style-image: url("chrome://browser/skin/devtools/option-icon.png");
-moz-image-region: rect(0px 16px 16px 0px);