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My most-wanted feature in Safari (and Orion) is first-party website-data whitelisting. I have a limited number of sites whom I trust to store data. Everyone else should be a tabula rasa each visit.

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I use the Cookie AutoDelete browser extension for this purpose, which besides the name handles more than just cookie data.

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

Firefox has first-party whitelisting. Block all website data and then whitelist.

Does that let cookies exist temporarily? If so, when do they get purged?

There's an option for "delete cookies and site data when Firefox is closed", and you can allow sites to have persistent cookies. Also to block them from even use cookies, if that's your cup of tea, but I've found it works great this way: sites work but I don't keep logged in at every site all the time - after I close the browser window it's an instant log out for every site.

Thanks for the tip! I didn't know it's built-in, I'll check it out.

If you're willing to switch browsers, Firefox has this option built in. It flushes all cookies on exit, except from domains in the whitelist. Been using it for years!

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