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#21
Oh, great! Thanks for letting me know. :)
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Do you use any third party anti virus software with strong settings?
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You can put the Tab Bar vertically on the side of the browser window in Vivaldi too. There's no auto hide option yet, but the feature request on the Vivaldi forum already has a fair amount of upvotes, so the likelihood of it getting implemented is there. You can add your vote here. For now, you could create a keyboard shortcut or a mouse gesture for toggling the visibility of the Tab Bar.
Instead of the Tab Bar you could view and manage your Tabs from the Window Panel, which is also on the side of the window and does have the auto hide option. Or use Quick Commands.