A320 CREW FOUND THE FIRE BOTTLE SQUIB CIRCUIT BREAKERS WERE TRIPPED.

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DURING CRUISE; FO NOTICED THAT ALL 4 ENG FIRE BOTTLE SQUIB CIRCUIT BREAKERS WERE OPEN. WE ASSUMED THEY WERE PULLED DURING SOME PREVIOUS MAINT ACTION. CONTACTED THE ACR MAINT CTLR VIA ACARS. DECIDED TO LEAVE BREAKERS OPEN UNTIL AT GATE; UNLESS THE FIRE BOTTLES WERE NEEDED. THE ACR MAINT CTLR FOUND THAT THEIR CHKLIST FOR BRINGING AN ACFT INTO A HANGAR CALL FOR THESE BREAKERS TO BE OPENED; BUT THE CHKLIST FOR TAKING AN ACFT OUT OF THE HANGAR MAKES NO MENTION OF THESE BREAKERS. OURS WAS THE 4TH LEG FLOWN SINCE THE ACFT WAS TOWED FROM THE HANGAR. RECOMMEND THE MAINT CHKLIST BE MODIFIED TO ENSURE ANY CIRCUIT BREAKERS PULLED DURING HANGAR WORK ARE RESET UPON RETURNING ACFT TO SVC. THESE BREAKERS ARE NOT MONITORED BY THE ECAM SYS. ALL 4 CAPTS SHOULD HAVE NOTICED THE LACK OF SQUIB LIGHTS DURING PREFLT FIRE SYS CHKS. CTR JUMP SEAT HEADREST CAN PARTIALLY OBSCURE THE BREAKERS IN QUESTION; BUT WAS NOT A FACTOR ON OUR FLT. SUPPLEMENTAL INFO FROM ACN 565375: 2/3 OF THE WAY TO LAX; I NOTICED THAT 4 CIRCUIT BREAKERS IN A ROW WERE OUT. THEY WERE THE 2 ENG FIRE BOTTLE SQUIBS (I BELIEVE AROUND POS Q45; Q46; Q47; Q48). AFTER A FEW ACARS MESSAGES WITH MAINT; WE FIGURED THEY WERE MISSED DURING OUR PREFLT. WE DISCUSSED POSSIBLY RESETTING THE BREAKERS; BUT DECIDED TO LEAVE THEM OUT UNLESS THERE WAS A NEED TO USE THE ENG FIRE BOTTLE. AFTER NUMEROUS ACARS MESSAGES WITH THE MAINT CTLR; IT APPEARS THAT THE BREAKERS MIGHT HAVE BEEN OUT FOR 4 FLTS. THE MAINT CTLR WAS ADDRESSING THE ISSUE THAT THE HANGAR DOCKING CARDS MENTIONS PULLING THE BREAKERS INBOUND; BUT DOESN'T MENTION RESETTING THEM ON THE EXIT CARD. AS FOR MYSELF AND CAPT; WE UNDERSTAND WE BOTH MISSED THEM ON THE PREFLT AND ON THE FIRE TEST WITHOUT THE ILLUMINATED SQUIB LIGHT.