This is a test

It works. Someone says it doesn't but you actually have to enable 'on browser restart, etc' for it to do anything. The 3rd screenshot in the add-on page here shows that checkboxes on the top row not checked need to be checked.

happy

I was starting to feel intoxicated until the end of the week.

This is the one.

I think this is not nessecary on Desktop, the "Data protection-Cookies and Website data - Manage exceptions" should deal with that.

Essential on mobile, to delete all cookies apart from selected sites. I integrated it to my custom addon collection

https://addons.mozilla.org/de/firefox/collections/17446767/Fenix-Addons/

it works pretty great! The UI is usable although a little small, and Addons are able to modify cookies and site data on Firefox Mobile.

A mobile interface with bigger buttons would be great.

I will ask the developers to add the addon among others to the official list.

Problem is - it does not delete any cookies. After enabling on-leaving for the domain, and closing the tab. And exiting the browser. And again closing the tab. The cookies, per Mozilla, all 10 of them from the domain are STILL THERE. Makes this useless.

DO. NOT. USE! It hasn't been updated in 3 years.