Nice idea for an extension BUT, selecting Tab Unhoarder's "skip" button (in FF 62 at least) does nothing ...and when selecting Tab Unhoarder's "close" button it does close the current tab BUT then its menu disappears and you have to re-select the Tab Unhoarder toolbar button to get it to reappear again which is a waste of time compared to simply using the FF key combination to close the current web page (Ctrl & W).
---I hope this can be repaired so this extension can be used from page to page while its menu remains open until closed by the user (or maybe automatically closed after not being used after a short period of time)---