I’ve just personally installed Opera, then the extension above and then PrivDog. Initially it appears to all work as expected.
If you want to also try Opera beta testing at your own risk, as I said it’s not supported, then I’ve made the Chrome extension available for manual download from the following URL:
I dragged and drop the .crs file to Opera 17 and Opera asked if I wanted to install. I said yes and it worked.
Over a month or so ago I tried Privdog in one of the previous Opera builds (either a Next or Developer stream) and that also seemed to work. I drag and dropped the .crx file to Opera and that made it start installing Privdog and working afterwards. I only used that build briefly so my findings are preliminary.
Good to know Privdog is working for when the new Opera is complete enough to make this dinosaur move.