diff --git a/chrome/content/zotero/xpcom/translation/translate.js b/chrome/content/zotero/xpcom/translation/translate.js
index c521fc3093..4cbb049793 100644
--- a/chrome/content/zotero/xpcom/translation/translate.js
+++ b/chrome/content/zotero/xpcom/translation/translate.js
@@ -240,7 +240,7 @@ Zotero.Translate.Sandbox = {
 				if(!Zotero.isBookmarklet) arg = JSON.parse(JSON.stringify(arg));
 				return translation.setSearch(arg);
 			};
-			safeTranslator.setDocument = function(arg) { return translation.setDocument(arg) };
+			safeTranslator.setDocument = function(arg) { return translation.setDocument(new XPCNativeWrapper(arg)) };
 			var errorHandlerSet = false;
 			safeTranslator.setHandler = function(arg1, arg2) {
 				if(arg1 === "error") errorHandlerSet = true;
@@ -249,14 +249,6 @@ Zotero.Translate.Sandbox = {
 						try {
 							item = item.wrappedJSObject ? item.wrappedJSObject : item;
 							if(arg1 == "itemDone") {
-								var sbZotero = translate._sandboxManager.sandbox.Zotero;
-								if(sbZotero.wrappedJSObject) sbZotero = sbZotero.wrappedJSObject;
-								if(Zotero.isFx && !Zotero.isBookmarklet
-										&& (translate instanceof Zotero.Translate.Web
-										|| translate instanceof Zotero.Translate.Search)) {
-									// Necessary to get around object wrappers in Firefox
-									item = translate._sandboxManager._copyObject(item);
-								}
 								item.complete = translate._sandboxZotero.Item.prototype.complete;
 							}
 							arg2(obj, item);
@@ -346,7 +338,6 @@ Zotero.Translate.Sandbox = {
 						if(!Zotero.Utilities.isEmpty(sandbox.exports)) {
 							sandbox.exports.Zotero = sandbox.Zotero;
 							sandbox = sandbox.exports;
-							if(Zotero.isFx && sandbox.wrappedJSObject) sandbox = sandbox.wrappedJSObject;
 						} else {
 							translate._debug("COMPAT WARNING: "+translation.translator[0].label+" does "+
 								"not export any properties. Only detect"+translation._entryFunctionSuffix+
@@ -389,10 +380,11 @@ Zotero.Translate.Sandbox = {
 			if(Zotero.isFx && Zotero.platformMajorVersion >= 33) {
 				for(var i in safeTranslator) {
 					if (typeof(safeTranslator[i]) === "function") {
-						var func = safeTranslator[i];
-						safeTranslator[i] = translate._sandboxManager._makeContentForwarder(function() {
-							func.apply(safeTranslator, this.args.wrappedJSObject);
-						});
+						safeTranslator[i] = translate._sandboxManager._makeContentForwarder(function(func) {
+							return function() {
+								func.apply(safeTranslator, this.args.wrappedJSObject);
+							}
+						}(safeTranslator[i]));
 					}
 				}
 			}
@@ -442,7 +434,7 @@ Zotero.Translate.Sandbox = {
 		 */
 		"selectItems":function(translate, items, callback) {
 			function transferObject(obj) {
-				return Zotero.isFx ? translate._sandboxManager._copyObject(obj) : obj;
+				return Zotero.isFx ? translate._sandboxManager.copyObject(obj) : obj;
 			}
 			
 			if(Zotero.Utilities.isEmpty(items)) {
@@ -1502,7 +1494,11 @@ Zotero.Translate.Base.prototype = {
 	 */
 	"_generateSandbox":function() {
 		Zotero.debug("Translate: Binding sandbox to "+(typeof this._sandboxLocation == "object" ? this._sandboxLocation.document.location : this._sandboxLocation), 4);
-		this._sandboxManager = new Zotero.Translate.SandboxManager(this._sandboxLocation);
+		if (this._parentTranslator && this._parentTranslator._sandboxManager.newChild) {
+			this._sandboxManager = this._parentTranslator._sandboxManager.newChild();
+		} else {
+			this._sandboxManager = new Zotero.Translate.SandboxManager(this._sandboxLocation);
+		}
 		const createArrays = "['creators', 'notes', 'tags', 'seeAlso', 'attachments']";
 		var src = "var Zotero = {};"+
 		"Zotero.Item = function (itemType) {"+
@@ -2274,7 +2270,7 @@ Zotero.Translate.Search.prototype.complete = function(returnValue, error) {
  */
 Zotero.Translate.Search.prototype._getParameters = function() {
 	if(Zotero.isFx) {
-		return [this._sandboxManager._copyObject(this.search)];
+		return [this._sandboxManager.copyObject(this.search)];
 	}
 	return [this.search];
 };
diff --git a/chrome/content/zotero/xpcom/translation/translate_firefox.js b/chrome/content/zotero/xpcom/translation/translate_firefox.js
index b2de56159f..c3f69cfdf0 100644
--- a/chrome/content/zotero/xpcom/translation/translate_firefox.js
+++ b/chrome/content/zotero/xpcom/translation/translate_firefox.js
@@ -471,13 +471,13 @@ Zotero.Translate.SandboxManager.prototype = {
 								}
 							}
 							if(passAsFirstArgument) args.unshift(passAsFirstArgument);
-							return me._copyObject(object[localKey].apply(object, args));
+							return me.copyObject(object[localKey].apply(object, args));
 						});
 					} else {
 						attachTo[localKey] = function() {
 							var args = Array.prototype.slice.apply(arguments);
 							if(passAsFirstArgument) args.unshift(passAsFirstArgument);
-							return me._copyObject(object[localKey].apply(object, args));
+							return me.copyObject(object[localKey].apply(object, args));
 						};
 					}
 				} else {
@@ -514,7 +514,7 @@ Zotero.Translate.SandboxManager.prototype = {
 	 * @param {Object} obj
 	 * @return {Object}
 	 */
-	"_copyObject":function(obj, wm) {
+	"copyObject":function(obj, wm) {
 		if(!this._canCopy(obj)) return obj;
 		if(!wm) wm = new WeakMap();
 		var obj2 = (obj.constructor.name === "Array" ? this.sandbox.Array() : this.sandbox.Object());
@@ -526,7 +526,7 @@ Zotero.Translate.SandboxManager.prototype = {
 			if(this._canCopy(prop1)) {
 				var prop2 = wm.get(prop1);
 				if(prop2 === undefined) {
-					prop2 = this._copyObject(prop1, wm);
+					prop2 = this.copyObject(prop1, wm);
 					wm.set(prop1, prop2);
 				}
 				wobj2[i] = prop2;
@@ -535,6 +535,53 @@ Zotero.Translate.SandboxManager.prototype = {
 			}
 		}
 		return obj2;
+	},
+
+	"newChild":function() {
+		return new Zotero.Translate.ChildSandboxManager(this);
+	}
+}
+
+Zotero.Translate.ChildSandboxManager = function(parent) {
+	this._wrappedSandbox = new parent.sandbox.Object();
+	this._wrappedSandbox.Zotero = new parent.sandbox.Object();
+	this.sandbox = this._wrappedSandbox.wrappedJSObject;
+	this._parent = parent;
+}
+Zotero.Translate.ChildSandboxManager.prototype = {
+	"eval":function(code, functions, path) {
+		// eval in sandbox scope
+		if(functions) {
+			for(var i = 0; i < functions.length; i++) {
+				delete this.sandbox[functions[i]];
+			}
+		}
+		this._parent.sandbox._withSandbox = this._wrappedSandbox;
+		Components.utils.evalInSandbox("with(_withSandbox){"+code+"};", this._parent.sandbox, "1.8", path, 1);
+		if(functions) {
+			for(var i = 0; i < functions.length; i++) {
+				try {
+					this._wrappedSandbox[functions[i]] = Components.utils.evalInSandbox(functions[i], this._parent.sandbox);
+				} catch(e) {}
+			}
+		}
+		this._parent.sandbox._withSandbox = undefined;
+	},
+	"importObject":function(object, passAsFirstArgument, attachTo) {
+		if(!attachTo) attachTo = this.sandbox.Zotero;
+		// Zotero.debug(object);
+		// Zotero.debug(attachTo);
+		this._parent.importObject(object, passAsFirstArgument, attachTo);
+		// Zotero.debug(attachTo);
+	},
+	"copyObject":function(obj) {
+		return this._parent.copyObject(obj);
+	},
+	"newChild":function() {
+		return this._parent.newChild();
+	},
+	"_makeContentForwarder":function(f) {
+		return this._parent._makeContentForwarder(f);
 	}
 }