If you figure out how to build a 600Gbps DDoS attack with Firefox, you are correct, that still qualifies as a DDoS and you can go to jail for it already. People have been tried in court for using Low Orbit Ion Cannon before, in a few extremely isolated instances. A DDoS is a DDoS, but intent is obviously important, and you do need to actually cause a problem for there to be a crime. I think clicking reload a couple times would be a stretch here for enforcement, perhaps it's possible but AFAICT it's not yet happened.
But we aren't talking about protest with a reload macro here, these are for-profit criminal botnets. And one if them just took down the largest DDoS mitigation network in the world. Which means there aren't many sites on earth left they can't take down. Much smaller attacks have nuked Github for days. Who's next to get "freedom of speeched"?