Firefox Add-on: https://addons.mozilla.org/addon/rewindpagerestorer/
Rewind helps recover page content you accidentally lose after a reload, redirect, fast click-away, or Single Page App navigation.
It captures a short-lived local snapshot of visible page content and restores it in an overlay so you can recover titles, thumbnails, images, and links.
Rewind stores snapshots locally in your browser using browser.storage.local. It does not send page content, browsing data, or snapshots to any server.