Verses with the word firmly in the Apocrypha (2 verses):

Sirach 42:17
The Lord hath not given power to the saints to declare all his marvellous works, which the Almighty Lord firmly settled, that whatsoever is might be established for his glory.

Additions to Esther 13:5
Seeing then we understand that this people alone is continually in opposition unto all men, differing in the strange manner of their laws, and evil affected to our state, working all the mischief they can that our kingdom may not be firmly established: