Forum:Morphing Jar 2 help

Player A has a set Morphing Jar 2 and a set All-Out Attacks Player B has two monsters

Player A flips summons Morphing Jar 2 and both players special summon their respective face down monsters then player A activates All-Out Attacks. If the monsters on player A's side is another Morphing Jar 2 and the monsters on player b's side is a Man-Eater Bug and a Penguin Soldier, who's effect will activate first? Does player A get priority to activate MJ#2's effect before player b's monsters??