Describe what you want to do. Not what the plugin is called.
Your key never reaches us. It is saved in this browser and sent straight to the provider you choose. This site is a static page with no server behind it, so there is nothing here that could receive it.
It does stay in this browser. Anyone using this computer could recover it. Use a key with a spend limit, and press Forget key when you are done on a shared machine.
Defaults come from testing against this catalogue. Two of them are floors and only go up — spending more can buy better answers, but searching less than what was tested only buys worse ones.