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

In my particular case I was rendering a Rails partial without render layout: false which was re-rendering the entire layout, including all of the scripts in the tag. Adding render layout: false to the controller action fixed the problem.