Gold app...

很好用，提供了一个更方便可信的马甲邮箱来源，可惜免费版不提供拦截营销邮件的服务。
另外建议加个单独设置每个马甲邮箱转发目标的功能
Perfect. It provides a more convenient and reliable source of aliase email. Unfortunately, the free version does not provide the service of intercepting marketing emalis.
In addition, I recommend to add a function to separately set the forwarding target of each aliase.

Good idea, but in general it's pretty useless as you can't switch your main email address to another one or even better using more email addresses.
So, if I don't want to use my main email address I can uninstall.
Also, premium is still not available here in Czech Republic which will probably be fixed in the future.

edit: I already removed extension for not being usable for me as I don't want to use my main email address.

how do i remove context menu??

There isn't a critical mass of users, so websites are already starting to block this domain. iCloud on the other hand has the critical mass and no one will dare to block their domain.
This should be a feature of an email provider. Although Mozilla attempting to be a privacy provider, these products are half-baked and quite a commitment on their part while the project may not last.

UPDATE I am giving this three stars because I have great hope it but believe it is too expensive for the FireFox spirit. I did have a problem when a logon page appears where I already have an account and FireFox Relay would not let me enter my actual email address to log in. I tried settings in FireFox add-on list and looked online for a support page with a solution; then I had to download an authenticator app on my phone to even make this comment which sparked a developer response that solved my problem! The solution, though, removes the helpful icon from every page where I might want to use it to create the temporary screen email. While I was looking at the solution (which was at a location not intuitive to me), I found another default setting to change.

Even upgrading doesn't remove the "upgrade now" upsell for phone number masking.

Also, let's get this straight: The add-on was updated to sell users on phone masking but not to (1) provide metrics on the use of the phone masks or (2) notify when a message/call has been received. Kind of annoying.

To answer the question from the developer below, restarting the browser does not hide the upsell for phone number masking.

seriously, just make this free and no premium asshole greedy af stuff. seriously and i will change my rating.

Very nice service by mozilla, whenever I don't feel like sharing my email address with a website or application, this tool comes in handy.

Only one thing I didn't like: the relay button to create an alias appears on the email field of login pages. Because of this I cannot see the button of my password manager (keepassxc). However, a developer guided me (see below) to disable this icon.