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http://astronomy.com/news/2015/12/space-...small-star

A brown dwarf star about the same size as Jupiter known as W1906+40 has been discovered to have a cloudy storm on its surface, similar in size to Jupiter's red spot.

Reportedly, this little brown dwarf is big enough that it might have some nuclear fusion occurring inside it. Its surface temperature is about 3,500 degrees F (1,900 degrees C) which is very cool by stellar standards. So cool in fact that it's possible for it to have clouds, composed in this case of tiny mineral particles.

Carl Sagan once explored the idea of an ecosystem of floating organisms inhabiting the upper atmosphere of Jupiter. In similar vein a brown dwarf with enduring gaseous belts and clouds on the cool side might be the only candidate for life subsisting on a "star". But it's extremely unlikely for a variety of reasons that Jupiter would be sporting complex forms of any kind; and simple, microbial stuff surviving at the top of a brown dwarf would probably have originated from elsewhere in panspermia fashion.