I pick between the two. Of late that responsibility has been pretty well taken care of by the Forget Me Not extension on Firefox, although I think it's endangered (like a lot of things that have to do with Firefox and its extensions.)

You can set rules with three clicks, four clicks if you want that rule to be temporary and thrown away on browser restart. You may choose between never deleting, deleting on browser close, deleting on tab close, or just throwing them away. The initial setup for default policy has a few UI issues, but the author put a lot of work into it.

https://addons.mozilla.org/en-US/firefox/addon/forget_me_not...