In Firefox after today’s update, I stopped working Console.log (); What to do?
Answer 1
What does it mean “not working”? Where does not work? Check the scripts connected on the page: Console variable can be overridden by changing the standard behavior. This can be done unnecessary (for example, in case of error = instead of == or === ).
Answer 2, Authority 100%
What is the Console object itself? It should be like this: 
Check if it did not overplay it any script.
