@SweetP haha no worries, glad the image upload in your forum is working again.
cache is not set to be deleted so I can safely rule that out. it seems cookies are again showing up e.g. I am seeing an entry for this forums URL. I am unsure as to what was going on initially. I think we can consider this solved. I'll ping, if this happens again with another site.
Thanks for making cookie 
gentle ping on this.
I looked at the tutorial for that on https://cookie5app.com/ but it does not related to the problem I am seeing.
I disabled the timer. I whitelisted one of the services that keeps kicking me out in Firefox Security Settings (Cookies and Website Data). The issue I am seeing is, that although Firefox shows some cookies, those are never shown in Cookie. Thus I have no way of adding those to my favorites or whitelist them.
Is this a known issues?
PS: It seems attaching images is not possible. Click on image icon results in and uploading an image results in 
Anyhow here's a screenshot of the cookies in Firefox which are not shown in cookie (30 days):
https://upload.disroot.org/r/c8MaWfQr#lqQqPJi00xaDLAXija+MtSYn48OmFD9K1cce+AfFyCY=
Looking good. Thanks for the quick fix and that on a sunday.
Make sure to also enjoy your weekend 
ping on this. Russell do you have any idea how this use-case could be dealt with?
It's hard to understand what the setting does, because the text is cut off. see screenshot
Confirming as well, that with 5.0.10.8 cookie no longer shows after startup.
Thanks for adjusting the window closing behavior. So much more expected. And thanks for your quick response in this case.
in system preferences > user cookie does not show up. so it seems nothing is set there.
and another problem: should I be recieving mail notifications for replies in this thread? No mails seem to be arriving.