diff --git a/toolkit/devtools/server/actors/root.js b/toolkit/devtools/server/actors/root.js
index 02d94ae24247..4cc53c39b9cd 100644
--- a/toolkit/devtools/server/actors/root.js
+++ b/toolkit/devtools/server/actors/root.js
@@ -196,6 +196,11 @@ RootActor.prototype = {
       this._parameters.onShutdown();
     }
     this._extraActors = null;
+    this.conn = null;
+    this._tabActorPool = null;
+    this._globalActorPool = null;
+    this._parameters = null;
+    this._chromeActor = null;
   },
 
   /* The 'listTabs' request and the 'tabListChanged' notification. */
diff --git a/toolkit/devtools/server/main.js b/toolkit/devtools/server/main.js
index 7ed006ee26ad..986f4e16967d 100644
--- a/toolkit/devtools/server/main.js
+++ b/toolkit/devtools/server/main.js
@@ -1555,6 +1555,8 @@ DebuggerServerConnection.prototype = {
     this._extraPools.map(function(p) { p.cleanup(); });
     this._extraPools = null;
 
+    this.rootActor = null;
+    this._transport = null;
     DebuggerServer._connectionClosed(this);
   },