Ctrl/⌘ + double-click on a tab to select all tabs from the same domain.
You can hold down the Ctrl/⌘ button and select tabs individually, or use Shift + click to select several tabs in a row. But there’s something very satisfying about having tabs scattered all over the Tab Bar and watch all the ones from the same domain get selected and highlighted with one simple move.
You can even use these shortcuts together to get a mixed selection of tabs faster.