Sync Tabs Across Windows, Same Tabs in Every Window

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I used Arc for years. Got a new MacBook, tried Dia, and it covers almost everything except the one thing I lean on constantly: open a new window and your tabs are already there. No other browser does it. Chrome syncs tabs across devices, but two windows on the same machine drift apart the moment you open the second one. I looked for an extension, found nothing, so I built one. Tabtwinsy mirrors tabs and tab groups across every window. Add a tab anywhere and it shows up everywhere. Close it anywh...