fix weird styles on firefox

customize.dist/alertify.css

@@ -121,7 +121,11 @@
 }
 .alertify .dialog nav button:not(.btn):not(.pure-button):not(.md-button):not(.mdl-button):focus,
 .alertify .alert nav button:not(.btn):not(.pure-button):not(.md-button):not(.mdl-button):focus {
-  border: 1px solid rgba(0, 0, 0, 0.1);
+  border: 1px dotted #302B28;
+}
+.alertify .dialog nav button:not(.btn):not(.pure-button):not(.md-button):not(.mdl-button)::-moz-focus-inner,
+.alertify .alert nav button:not(.btn):not(.pure-button):not(.md-button):not(.mdl-button)::-moz-focus-inner {
+  border: 0;
 }
 .alertify .dialog nav button.btn,
 .alertify .alert nav button.btn {

customize.dist/src/alertify.less

@@ -25,7 +25,6 @@
 }
 
 .alertify {
-
     position: fixed;
     background-color: @alertify-bg;
     left: 0;
@@ -134,16 +133,16 @@
                 }
 
                 &:focus {
-                    // FIXME
+                    border: 1px dotted @base;
-                    border: 1px solid rgba(0, 0, 0, .1);
+                }
+                &::-moz-focus-inner {
+                    border:0;
                 }
-
             }
 
             button.btn {
                 margin: 6px 4px;
             }
-
         }
     }
 }