diff --git a/js/main.js b/js/main.js
index ef4f6d7..f27dec5 100644
--- a/js/main.js
+++ b/js/main.js
@@ -1,5 +1,5 @@
 var Tegaki = {
-  VERSION: '0.9.1',
+  VERSION: '0.9.2',
   
   startTimeStamp: 0,
   
diff --git a/js/replayevents.js b/js/replayevents.js
index 1f09291..fe58572 100644
--- a/js/replayevents.js
+++ b/js/replayevents.js
@@ -38,6 +38,8 @@ class TegakiEventPrelude extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {}
 }
 
@@ -48,6 +50,8 @@ class TegakiEventConclusion extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {}
 }
 
@@ -58,6 +62,8 @@ class TegakiEventHistoryDummy extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     TegakiHistory.push(new TegakiHistoryActions.Dummy());
   }
@@ -218,6 +224,8 @@ class TegakiEventDrawCommit extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     Tegaki.tool.commit();
     TegakiUI.updateLayerPreview(Tegaki.activeLayer);
@@ -234,6 +242,8 @@ class TegakiEventUndo extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     TegakiHistory.undo();
   }
@@ -246,6 +256,8 @@ class TegakiEventRedo extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     TegakiHistory.redo();
   }
@@ -436,6 +448,8 @@ class TegakiEventAddLayer extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     Tegaki.addLayer();
   }
@@ -448,6 +462,8 @@ class TegakiEventDeleteLayers extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     Tegaki.deleteSelectedLayers();
   }
@@ -473,6 +489,8 @@ class TegakiEventMergeLayers extends TegakiEvent_void {
     this.type = TegakiEvents[this.constructor.name][0];
   }
   
+  static unpack(r) { return super.unpack(r); } // FF bug 1628719
+  
   dispatch() {
     Tegaki.mergeSelectedLayers();
   }