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.

In fact if you right click on the displayed domain, after doing 1 search, then by clicking on "delete" on the context menu, you will erase the cookies leaving those not concerned by your search.

No software is ever 100% complete; it is a continuous work for which many people are involved: not only to write code, but also to raise bugs and submit improvements ...

Hello, thank you for your review!

To answer your questions, no, cookies do not slow down Firefox; note that expired cookies are supposed to be deleted automatically when the browser is restarted.
And yes sort functions for each attribute like the date would be appreciable. I have to think about a kind of advanced interface for that.