Firestorm's unique nuclear-molecular structure allows him control over the structure of matter, allowing him to reshape it into any form desired. Firestorm can disperse his own molecular structure in order to pass through solid matter. His matter control allows him to "see" patterns in matter, enabling him to perceive heat patterns, as well as see through the use of radio waves and radar. He can basically turn anything into anything. Water to Magnesium. Steel to Plutonium.
During AVENGERS VS JLA he creates an atomic field sufficiently strong to block Thor, Firestorm is hella powerful.
One of his forcefields also block IM's repulsor rays during the fight in the Savage Land when JLA and AVG where fightning each other for taking the Cosmic Cube
Maybe, but considering FS powers, he may just absorbe the energy of IM'S armor and leav the armor depowered, so useless.
Even the Omni-Beam considering FS powers wouldn't work.
I think depending upon his armor.
If it's the sentient or Prometheus or Heroes Reborn armor, he could do it.
I honestly think those were his most sophisticated armors as of yet