The extension allows you to create aliases on the fly (although the free version has a limit of 5 aliases total). Note that the extension is at this time only available for Firefox on desktop.
Alternatively, if you have a Premium subscription, you can set up a catchall subdomain for yourself, so that e.g. [email protected] gets forward to you without having to create the alias in advance. Of course, this has the disadvantage of being able to associate that alias with other aliases you create.
Alternatively, if you have a Premium subscription, you can set up a catchall subdomain for yourself, so that e.g. [email protected] gets forward to you without having to create the alias in advance. Of course, this has the disadvantage of being able to associate that alias with other aliases you create.