SimpleLogin needs to have it's services integrated into ProtonMail. I know you're working on this, but I have some suggestions on exactly how it should be done. Upon alias generation using SL add-on, you should be able to choose what happens in ProtonMail when an email is sent to that alias. Personally, I would like to be able to either create a new folder, or choose from an existing folder to automatically filter the email to, or just go straight into my inbox (for example, for use with paid services). This allows me to choose various priority levels.

I should be able to choose an alias to use when drafting a new email from within ProtonMail.

Aliases should be able to be managed from within ProtonMail. Maybe add a new tab or something.

Better transparency regarding pricing and subscriptions. Which tiers include SL subscription?