diff --git a/background/style-manager.js b/background/style-manager.js
index a30f2d66..1a505a12 100644
--- a/background/style-manager.js
+++ b/background/style-manager.js
@@ -387,7 +387,8 @@ const styleManager = (() => {
 
   function urlMatchSection(url, section) {
     // FIXME: match sub domains?
-    if (section.domains && section.domains.includes(getDomain(url))) {
+    const domain = getDomain(url);
+    if (section.domains && section.domains.some(d => d === domain || domain.endsWith(`.${d}`))) {
       return true;
     }
     if (section.urlPrefixes && section.urlPrefixes.some(p => url.startsWith(p))) {