Contacts CardDav sync
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This would be a really nice addition.
I feel like vivaldi is trying to be this web suite that includes a lot of the tools that we use on a daily basis. It's not just a web browser.
But it's kinda pointless if I still have to use a fully featured mail client like thunderbird just for my contacts. Why use this powerful web browser then. I might as well just use a more basic web browser and use a mail client then.