Oh no! Do you know at what point it froze?
And yeah, the autosave function isn't really optimal. It saves every 10 seconds, but uses another save slot every time. I haven't found a way to reliably save on WebGL without using an autosave function.
With the Gift upgrade "Shooting Star", your Karma per second gets boosted by the amount of Favors you have, but there is no dialogue which triggers at 1 billion (so far. . .)
But it really hurts me that you've lost your progress :(
I hope that I can make it up to you somehow.