From Outlook, you can go to File > Manage Rules & Alerts > New Rule > Move messages from someone to a folder and under Step 2 you will need to specify from which address or domain you want to include and then still on Step 2 select the Junk folder and then finish the setup from there. You can also see the link below for reference as it has a couple of email addresses where you can also report this to Google as firebase it part of them.
https://www.reddit.com/r/Firebase/comments/1i7tvxr/firebaseappcom_spam_emails/
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.