I suggest creating a site-specific allowance by hand to see whether that solves the problem. This recommendation is based on past issues with some sites that use "local storage", also known as DOM storage, which Firefox also controls with your cookie preference. In those cases, Firefox blocked the local storage request unless there was an exception at the base level, i.e., coursera.org. On those sites, when you used the cookie dialog, you created an exception at the full domain level, i.e., www.coursera.org. So they didn't match.

You can add an exception by hand using the Privacy panel of the Preferences/Options dialog:

(LINUX) Edit menu > Preferences > Privacy

On the right side, click the Exceptions button, then enter coursera.org and click Allow.

Does that work?

Hi jscher2000

Thanks for the explanation.

Yes, adding coursera.org to the cookie exception list does help. Unfortunately, I tend to clear my cookies, along with the exceptions, on regular basis, so this is a bit of inconvenience but less so than switching between the "Keep Until" settings :-)

I would be interested to learn if the local storage prefewrences can be configured separately, perhaps through the about:config settings, otherwise I'm OK with your suggestion.

Thanks and all the best