diff --git a/compact/userChrome.css b/compact/userChrome.css
index 8c66e4a..5b8d21a 100644
--- a/compact/userChrome.css
+++ b/compact/userChrome.css
@@ -170,10 +170,6 @@
     margin-inline-start: -1px !important;
 }
 
-.tabbrowser-tab::after,
-.tabbrowser-tab::before {
-    border-inline-start: 1px solid var(--toolbarbutton-active-background);
-}
 .tabbrowser-tab::before {
     margin-inline-start: -1px;
 }
diff --git a/normal/userChrome.css b/normal/userChrome.css
index 11bc4c6..3891fac 100644
--- a/normal/userChrome.css
+++ b/normal/userChrome.css
@@ -170,10 +170,6 @@
     margin-inline-start: -1px !important;
 }
 
-.tabbrowser-tab::after,
-.tabbrowser-tab::before {
-    border-inline-start: 1px solid var(--toolbarbutton-active-background);
-}
 .tabbrowser-tab::before {
     margin-inline-start: -1px;
 }