Disable "Continue with Google" popup

I recently started seeing this popup when I click on the View more comments button at the end of a conversation in reddit when browsing on Firefox Mobile. It says "Log in to view the conversation". I'm not sure if it's ordinary JS, or the browser is showing it, or it's from the system. I've disabled the "Google Account sign-in prompts" described here - https://www.howtogeek.com/735152/how-to-turn-off-the-sign-in-with-google-prompt-on-websites/ , so it shouldn't be that. How can I disable it?