refactord to use firebase service
refactord to use firebase service

Mavmeister/KrakenBooks,szwang/OmniBooks,yoshi415/OmniBooks,yoshioka-s/OmniBooks,Mavmeister/KrakenBooks,yoshioka-s/OmniBooks,yoshi415/OmniBooks,SillyKnight/OmniBooks,szwang/OmniBooks,SillyKnight/OmniBooks