Dear all, I have the same problem. First, I tried to downgrade firefox from 72.0.2-1 to 72.0.1-1+b1, but the problem persisted. Then, I downgraded libsqlite3-0 from 3.31.0-1 to 3.30.1-1. Now, firefox starts again. I upgraded firefox back to the latest version and it is still working.
Kind regards Benjamin P. S.: A big thanks to the people providing snapshot.debian.org!
