Report Error 403: Vivaldi sync stopped working today in Windows PC Posted January 21, 2020 7 hours ago, Kashish said: Hey @An Enpass User, Thanks for sharing the details. Are you using any proxy, VPN or firewall on your system or the network? Also, did you install Vivaldi browser from the official site or any third party software provider? Thanks. It's using a firewall, but that has been the case all along, before it stopped working too. Enpass plugin works fine in Chrome. Vivaldi was installed from the official site. "Browser not trusted" is the message in the Enpass plugin log in Vivaldi.