Its as safe as any other institution. First Active covered by the irish protection scheme, so, if First Active go bust you will be guaranteed 90% of your savings, assuming you are watching the 15K limit.
If you are referring to the money as opposed to the institution then this is not quite true - the Rabo/Dutch CB guarantee and the Northern Rock/HMG 100% guarantee on deposits are better than the 90% of up to €22,222 offered by the Irish CB/IFSRA scheme.
if First Active go bust you will be guaranteed 90% of your savings, assuming you are watching the 15K limit.