The amazing thing is you believe it. How did those firefighters know it was going to collapse? Now let's put on our critical thinking caps and try to come to some sensible conclusions.
Up until that day there has never ever has been a collapse of a building by fire or bombs or planes (remember the Empire State Building was hit by a pretty big plane) built by steel. Never in the world. Then WTC 1 &2 collapse. Now why would firefighters think it was going to collapse? Did some of them hear it from their radios? I know some were walking down the street and saying the buildings were going to collapse but why would they think that when it was not hit by a plane?
And even if they thought that what the heck makes you think they would be part of any conspiracy. That's illogical and sloppy thinking. They could just have been influenced by wt 1&2 falling.
Silence is golden but duck tape comes in several colors.