(No bug): Add comments to some debugger server code. r=past in IRC

toolkit/devtools/debugger/server/dbg-browser-actors.js

@@ -196,6 +196,9 @@ BrowserRootActor.prototype = {
   onWindowTitleChange: function BRA_onWindowTitleChange(aWindow, aTitle) { },
   onOpenWindow: function BRA_onOpenWindow(aWindow) { },
   onCloseWindow: function BRA_onCloseWindow(aWindow) {
+    // An nsIWindowMediatorListener's onCloseWindow method gets passed all
+    // sorts of windows; we only care about the tab containers. Those have
+    // 'getBrowser' methods.
     if (aWindow.getBrowser) {
       this.unwatchWindow(aWindow);
     }

toolkit/devtools/debugger/server/dbg-script-actors.js

@@ -133,6 +133,9 @@ ThreadActor.prototype = {
     this._threadLifetimePool = null;
     this.conn.removeActorPool(this._breakpointPool);
     this._breakpointPool = null;
+    // Unless we carefully take apart the scripts table this way, we end up
+    // leaking documents. It would be nice to track this down carefully, once
+    // we have the appropriate tools.
     for (let url in this._scripts) {
       delete this._scripts[url];
     }