(Firefox 58.0b11, Forget Me Not 0.8.6 [with quite a few extensions enabled, and many about:config changes. I can share more details if needed, I just have no idea what you'd want to know])
This seems great, and I wouldn't mind using this over CAD, but I cannot for the life of me get greylisted-host cookies to clear on startup. I have two greylist rules:
*.youtube.com (previously just youtube.com, I had hoped a more flexible rule - that would also include cookies that Firefox says are part of the .youtube.com domain - would have been a solution but it made no difference)
multiup.eu
I have the following enabled:
Clean on browser start:
Cookies
Apply Rules
Local Storage
Apply Rules
Making sure I have no multiup.eu or youtube.com tabs open in the two windows I have open, I exit Firefox from the File menu and start it again after all the windows are closed. When I check about:preferences#privacy->Show cookies two minutes later, I still have the same multup.eu and YouTube cookies.