diff --git a/js/abp-hide-filters.js b/js/abp-hide-filters.js
index 25a350428..36090cdd6 100644
--- a/js/abp-hide-filters.js
+++ b/js/abp-hide-filters.js
@@ -377,10 +377,22 @@ FilterContainer.prototype.add = function(s) {
     var i = hostnames.length;
     if ( i === 0 ) {
         this.addGenericSelector(parsed);
-    } else {
-        while ( i-- ) {
-            this.addSpecificSelector(hostnames[i], parsed);
+        return true;
+    }
+    // https://github.com/gorhill/uBlock/issues/151
+    // Negated hostname means the filter applies to all non-negated hostnames
+    // of same filter OR globally if there is no non-negated hostnames.
+    var applyGlobally = true;
+    var hostname;
+    while ( i-- ) {
+        hostname = hostnames[i];
+        if ( hostname.charAt(0) !== '~' ) {
+            applyGlobally = false;
         }
+        this.addSpecificSelector(hostname, parsed);
+    }
+    if ( applyGlobally ) {
+        this.addGenericSelector(parsed);
     }
     return true;
 };
@@ -425,7 +437,6 @@ FilterContainer.prototype.addHostnameSelector = function(hostname, parsed) {
     // https://github.com/gorhill/uBlock/issues/145
     var unhide = parsed.unhide;
     if ( hostname.charAt(0) === '~' ) {
-        this.addGenericSelector(parsed);
         hostname = hostname.slice(1);
         unhide ^= 1;
     }
diff --git a/js/contentscript-end.js b/js/contentscript-end.js
index 3c5eaad9f..6956a8dd4 100644
--- a/js/contentscript-end.js
+++ b/js/contentscript-end.js
@@ -317,7 +317,7 @@ var uBlockMessaging = (function(name){
 
     var processHighHighGenerics = function(generics, out) {
         if ( injectedSelectors[generics] !== undefined ) { return; }
-        if ( document.querySelectorAll(generics) === null ) { return; }
+        if ( document.querySelector(generics) === null ) { return; }
         injectedSelectors[generics] = true;
         if ( out !== undefined ) {
             var selectors = generics.split(',\n');