That's a pretty big "if". The escape velocity of a star, even a brown dwarf, is pretty high, and if you though that the Earth's atmosphere got in the way of space flight, whew! They'd need to go directly to nuclear rocket.
Then there's the question of how large the minimum intelligent entity would be. They need to be diffuse enough to float. Whoops, that means that their brain "cells" need to communicate with each other via wireless transmission. And that implies at each entity would need a huge transmission spectrum. Possibly they could do it at the microwave level, but they might need to go to terahertz or infrared. But the diffuse means that they require an immense volume.
Then there's the question of what they build the vehicle out of. It has to be something that will float in the area of the cloud within which they can live...or they've got to have some kind of remote manipulator.
I really think that space flight is extremely unlikely for this kind of life form. But they might well be able to think extremely well. Possibly they would be "inherently telepathic" to the extent of only having a group mind, as the individual floating entity would probably be too simple to be intelligent.