(Relay engineer here.) While we provide a Firefox extension with which generating an alias is just a click away, you're not dependent on Firefox specifically:

(Relay engineer here.) While we provide a Firefox extension with which generating an alias is just a click away, you're not dependent on Firefox specifically: you can generate and access your generated alias through the web interface at https://relay.firefox.com https://relay.firefox.com in any browser. (Also, I'm sure you've already tried a lot of things, but in case you didn't: perhaps refreshing Firefox helps? See https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings https://support.mozilla.org/en-US/kb/refresh-firefox-reset-a....)