No option to change the email address to forward emails to.
No option to get a generated alias address using the extension UI or with the right click.
Do not misinterpret me, the right click can only generate, not enter previously generated addresses.

I've used relay since it's launched. I enjoy it and feel it's safer than using something like 10 Minute Mail. The only issue I have with the extension is that would like the ability to see my aliases by clicking the extension rather than having to navigate to the page every time. Though, now that they added ability to add any new alias using a custom domain, I don't really need to worry about remembering a random email address anymore.

ok

I wish the add-on would allow me to select an alias for auto fill when i click the button on an email field.

When I click on the Relay icon nothing happens. Sending feedback won't get me an answer though, that's too bad