Can you be more specific: which shortcuts and what actions should they perform?

which shortcuts

Extension shortcuts that you can find on about:addons on firefox, currently Relay extension doesn't have any shortcut at all.

and what actions should they perform?

To simply open up the extension.

Currently we have to first click on the extension icon on firefox toolbar and then relay icon to open it up every time we have to copy our mask emails, which is slightly inconvenient. And while we can pin relay extension to toobar, some also prefer to keep the toolbar clean. Adding shortcuts for the extension will remove this problem.