Look into changing preview behavior to updating (and switching) to an already existing preview tab.

Previewing in wagtail opens a new browser tab every time it's saved.

After a few saves, it becomes pretty hard to track which browser tab has the most recent version.
I think it would be worth looking into updating into an already opened preview, if one exists.

Start by locating the Wagtail preview entry point and the browser-tab behavior used when a preview is saved. Trace how an existing preview is identified, if that behavior exists, and document the relevant tests or manual reproduction steps. Done means repeated saves update or switch to the existing preview tab instead of opening another one.

Written by the indexing model from the issue text.