Hi there,

The message you see means that Firefox believes you have to log in to the network (as if it were a public Wi-Fi) to access the internet. It's not related to Mozilla accounts. For more details, see Captive portal detection.

Are you actually able to access the internet? What happens if you try to open http://detectportal.firefox.com/canonical.html (the URL used for checking) directly?

I have checked on both devices and they are connected to the same Wi-Fi at the moment, however the older laptop is still showing the same problem. I am able to access my Mozilla account and type out this reply, but whenever I try to use a search engine or go to a site like Youtube it denies me any internet access. Opening your provided link works as normal and leads to the "Captive Portal Detection" post. Having now reviewed the information there I can add that I was not having any additional sign in page show up. Seeing as i have reconnected to the Wi-Fi / Ethernet already, I will try a full restart and checking if I have Mozilla VPN enabled. As an aside, I find it strange that this issue shows up on my old laptop, which I have not been moving around unlike the newer one which constantly remains connected to the Wi-Fi, I am unsure if this could be relevant in some way. Thank you for the reply, if the restart or anything else works I will make sure to post another reply.

Update: Performing a full update seems to have solved to issue now. I am unsure if that is because I restarted whilst disconnected from the ethernet cable or some other reason. Regardless, thank you for the direction. As another aside, the reasoning for two questions existing is due to some weird technical problem which stopped me from accessing the first question I posted, promting me to write this one instead as they were both meant to try explain the same problem.