Adding PayPal key to a browser

[vintagemarian]

How do I add the key to my browser? I can't find the instructions. I'm using Firefox at the moment.

[kernowlass]

@vintagemarian 

https://www.paypal.com/us/smarthelp/article/how-do-i-know-if-the-paypal-key-has-been-added-to-my-bro...

[vintagemarian]

I followed the link. However, it did not address my question. Thanks anyway. Yours was the only reply.