A trigger and safety interlock feature for a fastener driving tool having a power mechanism operable in a fastener driving stroke during which a fastener is driven into a workpiece. The invention comprises a manually operable trigger movable between a rest position and a firing position, a workpiece engageable safety member movable between a standby position and an actuating position, and a control mechanism associated with the power mechanism and the trigger for initiating a drive stroke only when the trigger moves from its rest position to its firing position. The invention features an interlock configuration defined on the trigger and on the safety member for permitting the safety member to move from its standby position to its actuating position only when the trigger is in its rest position; permitting the trigger to move from its rest position to its firing position only when the safety member is in its actuating position; permitting the trigger to return from its firing position to its rest position only when the safety member is in its actuating position; and preventing the safety member from returning from its actuating position to its stand by position while the trigger is in its firing position.