diff --git a/alternative_user_files/userChrome_windows.css b/alternative_user_files/userChrome_windows.css
index 0902d88..3f6e6b6 100644
--- a/alternative_user_files/userChrome_windows.css
+++ b/alternative_user_files/userChrome_windows.css
@@ -918,6 +918,7 @@ toolbar[brighttext] {
 #navigator-toolbox::after {
   border-bottom: 0!important
 }
+#browser vbox#appcontent tabbrowser,
 #content,
 browser[type=content-primary],
 browser[type=content] > html {
diff --git a/userChrome-files/remove_white_flash.css b/userChrome-files/remove_white_flash.css
index e8d17f4..57c3cb5 100644
--- a/userChrome-files/remove_white_flash.css
+++ b/userChrome-files/remove_white_flash.css
@@ -1,3 +1,4 @@
+#browser vbox#appcontent tabbrowser,
 #content,
 browser[type=content-primary],
 browser[type=content] > html {
diff --git a/userChrome.css b/userChrome.css
index 75e3874..19292af 100644
--- a/userChrome.css
+++ b/userChrome.css
@@ -923,6 +923,7 @@ toolbar[brighttext] {
 #navigator-toolbox::after {
   border-bottom: 0!important
 }
+#browser vbox#appcontent tabbrowser,
 #content,
 browser[type=content-primary],
 browser[type=content] > html {