diff --git a/js/lib/ObjectCopy.js b/js/lib/ObjectCopy.js
index 43242da..14f0c61 100644
--- a/js/lib/ObjectCopy.js
+++ b/js/lib/ObjectCopy.js
@@ -32,6 +32,16 @@ class ObjectCopy {
         }
       }
     }
+
+    // add the values that would otherwise be deleted back to our object. (We need that so user-defined
+    // sites don't get forgotten)
+    for(var k in existing) {
+      if (! out[k]) {
+        out[k] = existing[k];
+      }
+    }
+
+    return out;
   }
 
   static pruneUnused(existing, target, ignoreKeys) {
diff --git a/manifest.json b/manifest.json
index 0a10bea..39d9872 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Ultrawidify",
-  "version": "3.2.0-a2",
+  "version": "3.2.0-a3",
   "applications": {
     "gecko": {
       "id": "{cf02b1a7-a01a-4e37-a609-516a283f1ed3}"