Clicking the addon button in browser brings up an Ad page for Relay, VPN, etc. To even see your Relay email, you have to click "Manage all masks" just to bring up a link to relay site on another tab. You can't even copy and paste from the Add on button because your mozmail emails are not even displayed.

Works fine for me and serves it's purpose. Lots of people down-voting or crying about it but probably still use FB. The process is simple, most of the problems are user specific or can't read instructions. The only thing I don't like is the addon button does nothing, doesn't even show you your mask, just a giant ad in the middle. You still have to click away to another site to copy and paste. The relay auto detect for field is also hit or miss. As far as getting emails relayed, works well and I haven't had issues