If you see a lot of user stories in a short period of time, Instagram may show a "suspicious activity" message and ask you to log in again.
I've seen it a few but I didn't have any problems after logging in again.
But this is not just about the extension, if a user follows users / likes posts or sees stories via the Instagram interface in a short period of time, Instagram may ask you to log in again. This is Instagram's security procedure.