back out a fix I made on the 15th, no bug. Turns out Camino actually does use nsCocoaWindow for <select>, and allowing popups caused a Tp regression because they also make their own <select> window (no need for a second one in nsCocoaWindow). Another victim of Camino's crazy <select> hack.

widget/src/cocoa/nsCocoaWindow.mm

@@ -148,6 +148,9 @@ nsresult nsCocoaWindow::StandardCreate(nsIWidget *aParent,
     if (mWindowType == eWindowType_popup || mWindowType == eWindowType_invisible)
       features = 0;
 
+    if (mWindowType == eWindowType_popup)
+      return NS_OK;
+
     mWindow = [[NSWindow alloc] initWithContentRect:rect styleMask:features 
                                 backing:NSBackingStoreBuffered defer:NO];