SOMA and Outer Wilds are still haunting me like this.

Are you aware of about:unloads?

Sending a confirmation email is what works.

Under about:unloads, you will see a list of open tabs, sorted by resource usage. You can click-spam the “Unload” button until that list is empty, or until the most resource-intensive tabs are off the list.

This does not require any third-party dependencies, and the tab will still be present on top. The site will reload once the tab is selected again.