Improve Cookie settings

about:preferences#privacy

Before: [_] Accept Cookies from sites

After: [_] Accept Cookies from clearnet sites [X] Accept Cookies from .onion sites

I had to add my .onion site to "Exceptions"(Allow for session). It automatically cleared when I restart the browser.

Please make this permanent by: a) Add new option: [X] Don't clear my cookie exceptions list. b) Or, add new cookie option, like above.