My block settings are not saved

Thank you David, that's an interesting post. I just replied to it and will keep an eye on it.

The issue is very annoying but I will accept the sitation as it is, as the results of all the testing didn't bring me any stable solution.

Thanks again!
(I'll get back to you for the other issue for updating my subsite and the white screen, which could be related to this)

I had a little more of a nose around this issue.
And i recall FF has some settings that Clear Cookies on Exit, which would also clear the localStorage.
And in v91 they added this:

https://blog.mozilla.org/security/2021/08/10/firefox-91-introduces-enhanced-cookie-clearing/

I wonder if theres any new settings in the preferences that are clearing your cookies on logout.
Might be something there....

Hi David, thank you so much for that information!
I'm quite sure this is the cause of my problem.
I've no downgraded to FF 90 and will not install newer versions for now.
To be honest, I haven't tried version 91 and change the setting to keep all cookies, as that's not what I want, and will also give me other problems.

If you see more tickets about this issue I'd like to hear about it. I'm sure there are more FF91 users having the issue.

Thank you!

Yeah i can imagine this will cause quite a few headaches, lets hope they make those changes an Opt In as opposed to default :) If i find anything else ill try to update this topic.

Glad to be of some help. And thanks for sharing your findings, i am sure others will find it useful.