Google options provide 404 errors. Half of the other options do absolutely nothing. This plug (when it works) does nothing more than copy and paste your current tab into an archive's homepage.

Great for lost files

Great extension that does exactly what it needs to and handy to have for finding stuff that's been deleted.

Life-saver to conveniently retrieve an archived/cached version of an unavailable page. Free and open-source works great under Firefox 57+.

just works thanks