[Karunamon]

Even on completely isolated distributions like Tor Browser or enterprise ESR installs. The only way you avoided this is if you were running Nightly or Developer or the normal one on Linux, and you disabled signature checks.

[kreetx]

Yup. Am on macOS and Nightly and still got hit with the isdue (luckily the fix was already out).

Guess we'll see a post-mortem soon and get to know how did this even came to be.