I've found a great little Mac app that runs system-wide with any browsers you happen to use, managing your cookies for you, called: Cookie.
So as a reminder cookies range from the useful (keeping you logged in), to the unnecessary, to the pernicious (tracking you, basically). Also, we have sites we trust, those we're ambivalent towards, and those we definitely don’t trust – right?
Trouble is, there is usually no way to define a “cookie policy” site-by-site in our browsers. The Cookies app solves that problem.
It shows you browser-by-browser in real time what cookies are on your computer, and what type (the big division is trackers and non-trackers, the former shown in red). You can then decide what to do about them.
I have it set so that when I close the browser, all tracking cookies are deleted wherever they've come from, and all cookies are deleted apart from sites I've marked as favourites.
This way, I don't need to continuously sign in to things like Vimeo (which I use a lot as a creator), while I know that anything left on my computer by Facebook, Google etc is completely removed.
That works for me, but there are lots of ways to configure this, including timed removal. It even works with iCloud across computers.
Basically, it solves the “all-or-nothing” nature of managing your cookies in browsers – and while I only use currently Safari personally, the cross-browser nature of it is cool too, as you could have it take care of things across a work and a personal browser, for instance.
It's not cheap at £25, but on the plus side it's a one-time purchase. For educating yourself about the cookies different companies use, as well as keeping them under control, it’s great. I’ve only just discovered it (it’s been around for a decade, apparently) but I think I’ll be using it for a long time.
Would be even better if they had a synced iOS app…