Yeah they were launching them from the neighborhood next to the 49ers stadium off the 30R departure end where planes go straight over those houses. I'm a huge fan of illegal fireworks because 'Murikeh, and the last few years I've gathered people on rooftops in the neighborhoods where people stock pile them rather than going out to official shows since you see so many more fireworks and from 830PM to 2AM usually. But up until now, people have had the common sense to not launch them near the end of runways. From the South San Francisco building rooftop I was on, I could clearly see people launching them FROM THE LONG TERM PARKING LOT AT SFO! Right off the departure end of the 28s. Happened several times from there over the night, then of course the people would high tail it out of there. Had there been a slow-climbing 28R departure, would have been just like this video.
They should just legalize fireworks in the Bay Area. Tens of thousands of them are going off each 4th of July + NYE + Cinco de Mayo + Chinese New Year anyway. It'd only be safer and people are more likely to not do it near airports if it is allowed elsewhere legally. If its illegal, people will just use any open lot or street. Cops can't keep up with it anyway, they barely are even able to enforce it.