diff --git a/manifest.json b/manifest.json
index b7d2ab11..bb4979a3 100644
--- a/manifest.json
+++ b/manifest.json
@@ -73,7 +73,12 @@
     },
     {
       "matches": ["<all_urls>"],
-      "include_globs": ["*.user.css", "*.user.styl"],
+      "include_globs": [
+        "*.user.css",
+        "*.user.styl",
+        "*.user.css\\?*",
+        "*.user.styl\\?*"
+      ],
       "run_at": "document_idle",
       "all_frames": false,
       "js": ["content/install-hook-usercss.js"]