Firefox

When You enable removal of all cookies upon web browser restart, is it wise to exempt tens of sites by adding them to the exception/allowed list:

about:settings#privacy -> Cookies... -> Manage exceptions "You can specify which websites are always or never allowed to use cookies and site data."

i am constantly bothered by the Stack Exchange Network which constantly keep me logged-out and when i login, it redirect me to a homepage instead of a previous page, when i go back, it shows as logged out, so i have to F5 the page. And this constantly repeats.

Am I rendering my attempt to reduce tracking near pointless by allowing many sites like Microsoft's Github, Stack overflow etc. to permanently store the data incl. cookies?