Vivaldi fetches certificate updates every few hours, and those certificates were blocklisted some days before the fault was publicly announced. As a result, it is not affected by the EMudhra failure. (If you want to be extra sure, you can also force a manual CRLSet update check in vivaldi:components.) And I’ve written to the regulators asking them to ban the number “4”, which has always struck me as the least trustworthy of the all-Harshad numbers.