JavaScript console.log causes error: “Synchronous XMLHttpRequest on the main thread is deprecated…”

Question

I have been adding logs to the console to check the status of different variables without using the Firefox debugger.

However, in many places in which I add a

Answer 1

It was happening to me in ZF2. I was trying to load the Modal content but I forgot to disable the layout before.

So:

$viewModel = new ViewModel();
$viewModel->setTerminal(true);
return $viewModel;