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Mozilla is experimenting with replacing 404 pages by Wayback Machine variants
Mozilla Firefox in a test mode via the Test Pilot program allowing users at the appearance of a 404-page automatically receive a link to the historic page in the Wayback Machine Internet Archive.
The function is called 404 No More and should ensure that dead links to pages that ever existed on existing servers can be easily seen. There appears only a link to the Wayback Machine snapshot if it really exists.
In order to retrieve a cached version of a site, the browser sends the URL of a 404 error page to Archive.org. Mozilla keeps track of how many people the add-on installed, how often 404 pages encountered are no match for what is at Archive.org and how often clicked is to Archive.org page. All of this data is to keep track on the server side. To track the total number of 404 pages that a user encounters a session must first be examined how that sits with the privacy of users, writes Mozilla on the GitHub page for the project.
The Test Pilot program established in May this year and is an add-on that can be added to the browser. The user then gets a new button in the toolbar from which experimental features can be accessed. Experimental features may be added in the future to new releases of Firefox and they liked it.
It is not easy to find pages that actually had a cached version, but through a message was correct referral to conjure up from the distant past Tweakers:
Firefox 404 No MoreViewing:-85
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