diff --git a/userstyles/github-tab-size.user.css b/userstyles/github-tab-size.user.css
index a95b51f..ebdf5ef 100644
--- a/userstyles/github-tab-size.user.css
+++ b/userstyles/github-tab-size.user.css
@@ -1,7 +1,7 @@
 /* ==UserStyle==
 @name          GitHub Tab-Size
 @description   Customize tab-width in GitHub code views
-@version       1.0.3
+@version       1.1.0
 @license       CC0-1.0
 @author        Jim Myhrberg (https://jimeh.me/)
 @namespace     jimeh.me
@@ -24,3 +24,12 @@
     tab-size: ghts-tab-size !important;
   }
 }
+
+@-moz-document domain("cs.github.com") {
+  body {
+    -moz-tab-size: ghts-tab-size !important;
+    -webkit-tab-size: ghts-tab-size !important;
+    -o-tab-size: ghts-tab-size !important;
+    tab-size: ghts-tab-size !important;
+  }
+}