@CrowsLabyrinth Multi Account Containers are a Firefox thing. In Vivaldi, because of the Chromium architecture, this is not feasible (with reasonable effort) on tab level. You can use different browser profiles to accomplish the task, but those will always run in separate windows.

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If you have a fediverse account, you can quote this note from your own instance. Search https://social.vivaldi.net/users/WildEnte/statuses/115748236286612987 on your instance and quote it. (Note that quoting is not supported in Mastodon.)