Cookie has NEVER been working correctlly with firefox, made me loose countless productivity time by multiples bugs : corrupting my profile, my extensions, it breaks history, and even breaking the browser (yes some websites doesn't work until you rebuild your database). I made multiple reports here just to see versions over versions with "fixes" that improves nothing. At the end, i just let firefox managing cookies as i m tired of reporting and loosing my profile and history again and again. Makes cookie useless since firefox is my main browser, actually i wish i can get a refund.

So long story short : if you need firefox browser working, stay away from cookie until the dev makes serious work AND tests to provide reliable software that doesn't break your browser. I have enough of chasing database corruption in firefox after cookie "cleans" it, it's going on for months if not years.

it seems this issue can occur, if you use Firefox's built in cookie removal. The fix is to use either Cookie or Firefox to manage your Firefox cookies, but not both.

Also, make sure you are using the latest versions of Firefox and Cookie - as some compatibility fixes were added to Firefox 80, and Cookie 6.1.1

👍

yes,
that is exactly it.

when you sync with browser bookmarks - manually selecting favourites is not possible....
and you would see the behaviour you're describing.

also, just to ket you know, there is a bug with Safari removals on Mojave.
I have it fixed now, and will release asap