What's that flower? You want to know how the firebreak works? Oh you want to know what it is! Here let me tell you.
The firebreak is an anything suppression system, from fires, to bullets, to lasers, to any bit of danger it will take it in a fraction of a second and put it into hyperspace where it can't hurt you. Many of our ships don't even have one. This one does!
How it works is the system will detect the emission spike of a weapon being used, and then the jump drives engage at a much smaller level and direct their cutting edge to score spacetime lightly except for where they intersect. Where they intersect, a hole is formed and whatever's there gets sucked in unless it has its own hyperspacial traction engines, which, like, fires and bullets and lasers and typical things you might suppress with a Firebreak don't.
Now near the galactic hyperspace gate we have significantly larger versions designed to defend against the strongest weapons any civilization can muster. Though outside of some ships, world ships, and around galactic gates, they aren't common.
Now it is ineffective against hypermetric weaponry as once the projectile exits hyperspace in its target it is too late to shunt back into hyperspace. Thankfully your Accord hadn't invented such weaponry.
Oh, you learned about jump drive suppression? Yes flower, while jump suppression is active the firebreak system is offline, so we have to be very careful with it.
And yes flower, The Terran Accord never stood a chance.