Has this project been abandoned?

[arvinsingla]

Lots of open PRs and issues that are very old. No support for Nest 9 and 10. Seems like there would probably be others who would be willing to put in basic maintenance to keep the project alive if you wanted to add maintaners.

[MichaelMarner]

It looks that way. We make use of this package and are maintaining a fork that is compatible with the latest NestJS release:

https://github.com/careapp-group/nestjs-firebase-admin