Hi! Confirmed.
Downgrading to chromium 76.0.3809.71-1 fixes the issue. I believe it would be good to raise the severity of the bug so that apt- listbugs notices it, but as one can argue that the browser is still usable without extentions and the package does not violate the debian policy, it would be up to the maintainer, the Debian Chromium Team, to set the severity to "serious". It could help to avoid duplicate bug reports tough. Best, -- Martin
