I cleared all my browsing data, disabled and uninstalled all Firefox addons (extensions), and restarted my laptop.
I still get this:
I also tried Private Mode (incognito) and that didn't help either. Finally, I uninstalled Firefox via
sudo pacman -Rns firefox and reinstalled it, but the same problem again!
Here's what is added in the cookies exceptions on Firefox:
I'm very confused, and I'm not sure what else to do.
To ensure that my clock was right, I ran
timedatectl set-ntp true on Manjaro and can see that the clock is correct.
I now get:
I have already seen this similar question, but it didn't help.