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

1. In Chrome, press F12
2. Develomping tools-> press F1.
3. See settings->general->Apperance: "Don't show chrome Data Saver warning"- set this checkbox.
4. See settings->general->Console: "Log XMLHTTPRequest" - set this checkbox too.

Enjoy