Is there some way to browse the communities on an instance in Arctic? I can't find it if it's there

If you scroll back to old posts, the post where you stopped gets marked as read but it should only get marked read when you scroll past it, not when you can first see it. The current behavior makes it so you can't spot a particular post to know you've reached as far back as you want to go.

Normally I want to accept most cookies and not delete them.

There are two sites that I want to delete cookies when I navigate away from them.

If I outright block cookies on these sites, they don't work properly.

I've tried a few cookie extensions and can't figure out how to basically whitelist everything except these two sites without manually whitelisting everything.