When you export accounts from Firebase, their passwords are encrypted using a modified version of the scrypt algorithm. This service can be used to validate passwords of accounts exported from Firebase.
You will need the hash parameters from Firebase. Go to Firebase Console > Authentication and click the menu on the top right corner of the users list, then click on Password hash parameters
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hash
Storyscript:
hashed = firebase-scrypt hash memCost:14 rounds:8 saltSeparator:"yoursaltseparator" signerKey:"yoursignerkey" salt="randomsalt" password="verysecurepassword"
Output:
GWWlYtpW8fgd