Dear all,

We are delighted to be able to announce the availability of the beta
Memento extension for Chrome. The extension is available in the Chrome
store:

https://chrome.google.com/webstore/detail/memento/jgbfpjledahoajcppakbgilmojkaghgm?hl=en&gl=US

Below, we include the description that accompanies the extension in the
Chrome store, which highlights its web time travel and 404-circumventing
features.

Your feedback would be much appreciated to help us get it ready for prime
time.

We would like to take this opportunity to thank:
- Harihar Shankar for the effort he invested in developing the extension.
- Luydmila Balakireva, Martin Klein, Michael Nelson, James Powell, for
their input during the development process.


Many thanks,

Rob Sanderson and Herbert Van de Sompel,
Los Alamos National Laboratory


==

Description

Travel to the past of the web by right-clicking pages and links.

Memento for Chrome allows you to seamlessly navigate between the present
web and the web of the past. It turns your browser into a web time travel
machine that is activated by means of a Memento sub-menu that is available
on right-click.

First, select a date for time travel by clicking the black Memento
extension icon. Now right-click on a web page, and click the "Get near …"
option from the Memento sub-menu to see what the page looked like around
the selected date. Do the same for any link in a page to see what the
linked page looked like. If you hit one of those nasty "Page not Found"
errors, right-click and select the "Get near current time"
option to see what the page looked like before it vanished from the web.
When on a past version of a page - the Memento extension icon is now red -
right-click the page and select the "Get current time"
option to see what it looks like now.

Memento for Chrome obtains prior versions of pages from web archives around
the world, including the massive web-wide Internet Archive, national
archives such as the British Library and UK National Archives web archives,
and on-demand web archives such as archive.is. It also allows time travel
in all language versions of Wikipedia. There's two things Memento for
Chrome can not do for you: obtain a prior version of a page when none have
been archived and time travel into the future. Our sincere apologies for
that.

Technically, the Memento for Chrome extension is a client-side
implementation of the Memento protocol that extends HTTP with content
negotiation in the date time dimension. Many web archives have implemented
server-side support for the Memento protocol, and, in essence, every
content management system that supports time-based versioning can implement
it. Technical details are in the Memento Internet Draft at
http://www.mementoweb.org/guide/rfc/ID/. General information about the
protocol, including a quick introduction, is available at
http://mementoweb.org.