I can confirm it too: after downgrading to the version from testing, both firefox and thunderbird do work again.
- Bug#949644: libsqlite3-0: Firefox immediately crashes at ... Lukas Helebrandt
- Bug#949644: libsqlite3-0: Firefox immediately crashe... Felicia P
- Bug#949644: Note that it also breaks thunderbird in ... Eric Valette
- Bug#949644: libsqlite3-0: Firefox immediately crashe... Rastersoft
