Bug with redux in firefox

[Andrii256]

Hello
Yesterday I created project using create-react-app, latest version.

In chrome everything fine, work very good.
But when I open my project in mozilla, I have bug.
And I even dont know which exactly details can be usefull because I absolutely no idea what happens.

[Andrii256]

I found bug.
Bug are there. Site began to work strictly after I remove this line