Add readme back in since it was accidentally removed

chrome/multi-row_tabs_below_content_Fx66+.css

@@ -1,3 +1,13 @@
+/* Makes tabs to appear on multiple lines below the web content */
+/* Tab reordering will not work and can't be made to work */
+
+/* It's recommended to move tabs new-tab-button outside tabs toolbar */
+
+/* Change the --multirow-n-rows to change maximum number of rows before the rows will start to scroll  */
+/* Scrollbar can't be clicked but the rows can be scrolled with mouse */
+/* This maximum visible rows won't work before Fx66 */
+/* So this setting does nothing on Fx65 and all tab rows will be shown */
+
 :root{
   --multirow-toolbar-height: 40px;
   --multirow-top-padding: 0px;