diff --git a/common/locale/en-US/repeat.xml b/common/locale/en-US/repeat.xml
index 88993e53..d83c566b 100644
--- a/common/locale/en-US/repeat.xml
+++ b/common/locale/en-US/repeat.xml
@@ -230,7 +230,7 @@
 
 <p>
     In most cases, any of the above may be prefixed with a <tt>!</tt> character
-    to invert the sense of the match.
+    to exclude matching sites.
 </p>
 
 <h2 tag="using-scripts">Using scripts</h2>
diff --git a/common/modules/contexts.jsm b/common/modules/contexts.jsm
index c8ba8951..35eab254 100644
--- a/common/modules/contexts.jsm
+++ b/common/modules/contexts.jsm
@@ -47,7 +47,9 @@ var Group = Class("Group", {
 }, {
     compileFilter: function (patterns) {
 
-        function siteFilter(uri) siteFilter.filters.every(function (f) f(uri) == f.result);
+        function siteFilter(uri)
+            let (match = array.nth(siteFilter.filters, function (f) f(uri), 0))
+                match && match.result;
 
         if (!isArray(patterns))
             patterns = Option.splitList(patterns, true);