Hi, the contexts of navigation or contextual identities were introduced with Firefox 53-57, this function erases all the cookies of the context used by the displayed tab when you call it.
In an update I will display the name of the context used.
Also i discovered a little bug in the main interface when you call this function. Under certain conditions the user should manually actualize the interface to see the cookies disappear.

> Please, add "Delete all cookies except protected".
When you "delete all cookies" only the protected ones remain.
It would not make sense to be able to protect a cookie when it could be erased in the same way as any other cookie.


> It would also be desirable in the list of protected cookies
Yes, that's right, I'm thinking about it.