Najlepszy!

This one actually works! I've tried several other similar add-ons, and none of them worked. But this one does.
If it had the option to clear everything when I close Firefox, then I'd give it five stars.

Simple, convenient and effective.

Deletes site data of all websites including history. This option should not be default or at-least there should be warning. I'm now using "Cookie Quick Manager" which allows choosing which ones to delete.

This system is already have Firefox browser. But it's save time.

YES, what I want.
Thank You

Me sirvio mucho para limpiar mi navegador ya que se ponia muy lento.

Great extension