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Wayback Machine 1.8.1 Compatible with Firefox 57+
Detects dead pages, 404s, DNS failures & a range of other web breakdowns, offering to show archived versions via the Internet Archive's Wayback Machine. In addition you can archive web pages, and see their most recent & first archives.
About this Add-on
If you used No More 404s on Test Pilot, this extention is for you!