diff --git a/userContent.css b/userContent.css
index d94cd2b..28dfe28 100644
--- a/userContent.css
+++ b/userContent.css
@@ -828,7 +828,7 @@
                  url-prefix("about:checkerboard"),
                  url-prefix("about:sync-log"),
                  url-prefix("about:memory"),
-                 regexp("^[file:///].*[^(html|svg|pdf|json)]$")
+                 regexp("^[file:///].*/$")
   {
     /* Base */
     html,
@@ -1058,7 +1058,7 @@
 
   /*= Directory View =========================================================*/
   @-moz-document url-prefix("about:sync-log"),
-                 regexp("^[file:///].*[^(html|svg|pdf|json)]$")
+                 regexp("^[file:///].*/$")
   {
     body {
       background-color: var(--in-content-box-background) !important;