Privacy Browser 3.12.1 is an emergency release to fix a crash. The transition to SwitchPreferenceCompat in Privacy Browser 3.12 was incomplete. Specifically, it was not possible for the new SwitchPreferenceCompat to set default values. As no new preferences (settings) were added in 3.12, this did not cause any problems for upgrades from 3.11. But it did cause problems for new installs, for upgrades from 3.10.1 or older, or if the apps data was wiped and it needed to repopulate the default values. In these cases, the app would crash every time it tried to start.