diff --git a/css/leptonContent.css b/css/leptonContent.css
index 892379b..d00c8bb 100644
--- a/css/leptonContent.css
+++ b/css/leptonContent.css
@@ -2843,6 +2843,16 @@
       --panel-border-radius: 0 !important;
     }
   }
+  @-moz-document url-prefix("about:addons") {
+    panel-list {
+      border-radius: 0 !important;
+    }
+  }
+  @-moz-document url-prefix("about:logins") {
+    .menu {
+      border-radius: 0 !important;
+    }
+  }
   @-moz-document url("about:home"), url("about:newtab") {
     .context-menu {
       border-radius: 0 !important;
diff --git a/src/contents/_rounding.scss b/src/contents/_rounding.scss
index b577d6e..d1d6b5d 100644
--- a/src/contents/_rounding.scss
+++ b/src/contents/_rounding.scss
@@ -92,6 +92,18 @@
     }
   }
 
+  @include moz-document(url-prefix "about:addons") {
+    panel-list {
+      border-radius: 0 !important;
+    }
+  }
+
+  @include moz-document(url-prefix "about:logins") {
+    .menu {
+      border-radius: 0 !important;
+    }
+  }
+
   @include moz-document(url "about:home", url "about:newtab") {
     .context-menu {
       border-radius: 0 !important;