Destiny did a fine job at being the Destiny-killer all on its own
Ahh, Firefall. What could have been...
It's the same button that's used to dodge on other javelins, so whatever that keybind is for you... I'm afraid I don't know the default because I immediately bound the dodge key to middle mouse like I did for Andromeda.
It was never meant to be an MMO in that sense though. It's a lot closer to Diablo - a lot of people can play, but only a few will see each other in a game session at any given time.
Firefall is probably as close as we're going to get to a truly massive MMOFPS for a while. It's a shame too because it had so much potential, and it got sunk by bad business practices moreso than by the product itself (though the abysmal gearing system certainly didn't help.)