Just one extension missing: Staying Alive
There is just one extension that is really missing for me, and the only reason that Vivaldi is no longer my default browser: Staying Alive.
It did work some time ago. Maybe by Vivaldi 1.6 that it just stopped, and without it it's impossible to me to work due to a really poor intranet site.
Is there any way to fix it, any workaround possible?
Try to report to see if it can be fixed for newer builds with all info you can give about that.