Johnson scored 29 of his points in the third, tying Milwaukee's Michael Redd (2002) for the most 3-pointers ever in a single quarter. He finished the game 10-of-14 from beyond the arc.
Andray Blatche put in 20 points and Paul Pierce added 14 off the bench for the Nets, who put the game away with a 17-3 burst starting the big quarter.
Deron Williams supplied 13 points and 13 assists.
The 76ers stumbled to a seventh straight loss despite 17 points off the bench from James Anderson.
Thaddeus Young added 14 for Philadelphia.
Millions of Getty images now available for free via embed tool
Boston schools pull out free condoms over wrapping complaints