Just noticed this thread whereas I was looking for it before posting my suggestion here : https://orionfeedback.org/d/3666-add-the-after-browser-exits-on-the-remove-history-items-feature
I still think my request is a bit clearer and more basic than this thread that is interesting though.
Would be great to be able to configure cookies to be auto deleted on browser close (or on a set timer). Much better alternative than having to manually clear them every morning
Why do you clear cookies every morning?
It's for privacy reasons. To limit the scope of tracking by advertising companies and just in general to make the web less "creepy".
Disabling cookies all together is a bit too harsh for everyday usage, and a lot of websites break in unexpected ways without cookies (and it's too much of a hassle to allow-list them each). So deleting cookies on an interval (or on browser close) is a reasonable trade-off.
I've been using https://cookieapp.com for some time to get this behavio (and more) in Safari. Furthermore, I know Google Chrome supports deleting cookies on browser close (https://support.google.com/chrome/answer/95647?hl=en&co=GENIE.Platform=Desktop#zippy=,delete-cookies-after-you-close-chrome)
Since Orion is positioning itself as a privacy concious browser, I think it would be good to at least have feature parity with Chrome on this.
Would make Orion even greater for at least the way I browse the web 
Maybe just use a private window?
I think this could also be used with profiles/containers which are in development. Ephemeral/temporary containers could achieve this.
It's a nonsolution but you can quickly access 'Clear Browsing Data' by shift+command+backspace. It is a click away from clearing all browsing history that way.
Vlad I don't believe that to be a proactive solution — I'd even argue it's a reactive solution. There are countless bad domains and whatever used for tracking, and filter lists/ITP reactively block them. It's, however, impossible to be able to list every bad thing (badness enumeration). Sanitizing on close is a comprehensive solution that systematically solves tracking via cookies. It makes persistent tracking not possible without the use of fingerprinting, which is a whole separate problem.
Don't get me wrong, ad/tracker blocking isn't completely useless, but only if they're used as a helping hand. They shouldn't be considered a primary means of defense because they're inherently flawed.
Sanitizing on close is already a feature of both Firefox and Chromium browsers, and so I think users would expect such a feature in a browser that's "private by design."
Good arguments.
We need entire specification of the feature:
Where is the setting, how does it look, how does it work.
You can put it under the Privacy category, and it can just be a simple checkbox "Clear cookies on close", with a popup warning the user that this could be a dangerous action. Something like "Are you sure? THis will clear all cookies and log you out of all your accounts when you quit Orion".
But, I still think using private windows is a better idea.
Where is the setting, how does it look, how does it work.
Chrome places the feature in Privacy and Security > Cookies and other site data. Here, you can enable it and set exceptions.
This is the popup for adding exceptions. Key thing here is that it allows for specific subdomains and catch-alls.
Firefox places their feature in a similar position in their Privacy & Security section. They also have a manage exceptions area, which functions pretty much the same as Chrome's.
Are there ay updates on this feature? It's been a few months now...
I'd also like to add that it should look similar to the "remove history" items. e.g. "after one day" "after one week". 
