diff --git a/dist/firefox/updates.json b/dist/firefox/updates.json
index 528786640..ad0adcf00 100644
--- a/dist/firefox/updates.json
+++ b/dist/firefox/updates.json
@@ -3,10 +3,10 @@
   "uBlock0@raymondhill.net": {
    "updates": [
     {
-     "version": "1.17.5.103",
+     "version": "1.17.5.104",
      "applications": { "gecko": { "strict_min_version": "52" } },
-     "update_info_url": "https://github.com/gorhill/uBlock/releases/tag/1.17.5rc3",
-     "update_link": "https://github.com/gorhill/uBlock/releases/download/1.17.5rc3/uBlock0_1.17.5rc3.firefox.signed.xpi"
+     "update_info_url": "https://github.com/gorhill/uBlock/releases/tag/1.17.5rc4",
+     "update_link": "https://github.com/gorhill/uBlock/releases/download/1.17.5rc4/uBlock0_1.17.5rc4.firefox.signed.xpi"
     }
    ]
   }
diff --git a/dist/version b/dist/version
index 96ec1ff63..0241b427a 100644
--- a/dist/version
+++ b/dist/version
@@ -1 +1 @@
-1.17.5.103
+1.17.5.104
diff --git a/src/js/cosmetic-filtering.js b/src/js/cosmetic-filtering.js
index 6d30a36d8..d10eb4100 100644
--- a/src/js/cosmetic-filtering.js
+++ b/src/js/cosmetic-filtering.js
@@ -1054,14 +1054,8 @@ FilterContainer.prototype.retrieveGenericSelectors = function(request) {
     for ( let type in this.lowlyGeneric ) {
         let entry = this.lowlyGeneric[type];
         let selectors = request[entry.canonical];
-        if ( typeof selectors !== 'string' ) { continue; }
-        let strEnd = selectors.length;
-        let sliceBeg = 0;
-        do {
-            let sliceEnd = selectors.indexOf('\n', sliceBeg);
-            if ( sliceEnd === -1 ) { sliceEnd = strEnd; }
-            let selector = selectors.slice(sliceBeg, sliceEnd);
-            sliceBeg = sliceEnd + 1;
+        if ( Array.isArray(selectors) === false ) { continue; }
+        for ( let selector of selectors ) {
             if ( entry.simple.has(selector) === false ) { continue; }
             let bucket = entry.complex.get(selector);
             if ( bucket !== undefined ) {
@@ -1080,7 +1074,7 @@ FilterContainer.prototype.retrieveGenericSelectors = function(request) {
                     simpleSelectors.add(selector);
                 }
             }
-        } while ( sliceBeg < strEnd );
+        }
     }
 
     // Apply exceptions: it is the responsibility of the caller to provide