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HTTP Framework for Time-Based Access to Resource States: Memento Herbert Van de Sompel, Michael Nelson, Robert Sanderson; IETF I-D Representatives of Los Alamos National Laboratory and Old Dominion University have published a first IETF Working Draft of HTTP Framework for Time-Based Access to Resource States: Memento. According to the editor's iMinds blog: "While the days of human time travel as described in many a science fiction novel are yet to come, time travel on the Web has recently become a reality thanks to the Memento project. In essence, Memento adds a time dimension to the Web: enter the Web address of a resource in your browser and set a time slider to a desired moment in the Web's past, and see what the resource looked like around that time... Technically, Memento achieves this by: (a) Leveraging systems that host archival Web content, including Web archives, content management systems, and software versioning systems; (b) Extending the Web's most commonly used protocol (HTTP) with the capability to specify a datetime in protocol requests, and by applying an existing HTTP capability (content negotiation) in a new dimension: 'time'. The result is a Web in which navigating the past is as seamless as navigating the present... The Memento concepts have attracted significant international attention since they were first published in November 2009, and compliant tools are already emerging. For example, at the client side there is the MementoFox add-on for FireFox, and a Memento app for Android; at the server side, there is a plug-in for MediaWiki servers, and the Wayback software that is widely used by Web archives, worldwide, was recently enhanced with Memento support..."

September 24, 2010 -- For those who use the Mozilla Firefox browser, you now have the option to time travel through the web.  MementoFox  is a free extension that users can add-on to their browsers. The extension implements the Memento protocal , which the Los Alamos National Laboratory and Old Dominion University are developing to enable capture of and access to older versions of websites. 

have the option to time travel through the web.  MementoFox  is a free extension that users can add-on to their browsers. The extension implements the Memento protocal , which the Los Alamos National Laboratory and Old Dominion University are developing to enable capture of and access to older versions of websites. 

Memento allows a user to link resources, or web pages, with their previous versions automatically.  The term Memento refers to an archival record of a resource as well as the technological framework that supports the ability to discover and browse older versions of Web resources.  One of the challenges of researching older versions of Internet resources is searching for them in web archives. With the Firefox add-on, users can easily view older versions in the same browser without having to search across archives. After a URL is specified in the browser, the newly released extension allows users to set a target day, using the slider bar (the "add-on").  The protocol will search archives across the web for previous versions of the URL.   As long as those archives are available on a server accessible across the web, MementoFox will return the previous targeted version. MementoFox is available for download  and developers interested in working with the protocol can join the development group .