Good.

I've been testing the free Firefox Relay service for a while and I've just decided to take the premium subscription.
I find it very practical and useful.
However, a function to see which sites are used for each alias would be very useful in the future.

Very nice, but wish add-on showed emails. If a website doesnt have the autofill with relay, its irritating to click multiple buttons to get to my emails, instead of the add-on in the tab bar just showing my emails

On many occasions autofills makes confusing, if you show the emails when I click on the icon from navigation bar, with a button to copy it will more useful for me.