Merge remote-tracking branch 'origin/MC-3939-firefox-text-ranges' into cms-team-1-delivery

Author: cspruiell

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/_preview.less

@@ -18,7 +18,7 @@
         i {
             font-style: normal;
         }
-        &:empty:before {
+        &.placeholder-text:before {
             content: attr(data-placeholder);
         }
     }

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/tabs/_default.less

@@ -45,6 +45,7 @@ div[data-role='tabs'],
                 white-space: normal;
 
                 span.tab-title {
+                    cursor: text;
                     display: block;
                 }