What causes NextJS Warning: "Extra attributes from the server: data-new-gr-c-s-check-loaded... "

I am getting the following warning from my Next.js application:

Warning: Extra attributes from the server: data-new-gr-c-s-check-loaded,data-gr-ext-installed,cz-shortcut-listen,data-lt-installed

I don't know why it happens. What is the explanation for this?

Disabling the Grammarly extension solved the problem for me.

You could upvote https://chromewebstore.google.com/reviews/9c74943a-2ebb-4f73-af5f-2b2945c97349 to lobby Grammarly to fix their extension.

Stack Overflow Q#75337953, score: 140