Memento Time Travel

Memento Time Travel

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

Memento Time Travel promo image
What is Memento Time Travel?

Memento Time Travel is a Firefox add-on that allows seamless navigation between the present web and the web of the past. By right-clicking pages and links, you can explore what they looked like at different points in time using web archives from around the world.

Stats date:
Users: 106 ▲ 5
Rating: 2.50 (2)
Version: 0.0.1 (Last updated: 2018-03-28)
Creation date: 2018-03-28
Weekly download count: 5
Firefox on Android: Yes
Manifest version: 2
  • *://*/*
  • <all_urls>
  • contextMenus
  • storage
  • webRequest
  • webNavigation
  • webRequestBlocking
Size: 603.29K
Email: Click to see
Risk impact: High risk impact
Risk likelihood: Low risk likelihood

Other platforms

Not available on Chrome
Not available on Edge

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

Memento for Firefox 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 Firefox 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 It also allows time travel in all language versions of Wikipedia. There's two things Memento for Firefox can not do for you: obtain a prior version of a page when none have been archived and time travel into the future.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 Firefox 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 General information about the protocol, including a quick introduction, is available at

For queries about the Memento for Firefox extensions and the Memento protocol, get in touch at

User reviews
Works OK, but only on desktop, not mobile. It's nice to have this feature in the browser, instead of using It's even better when the target web site supports the memento protocol (RFC 7089). This add-on's user interface is a little clumsy, with choice of desired date/time in one place, and choice of actions to perform in a different place. (Actions are in a context menu, reached by control-click on a link or in the page, and selection of date/time is in a different menu behind an icon in the top bar of the browser.)

Doesn't work. All it does is add the word "undefined" before the URL, which obviously doesn't achieve anything.
by Savannah, 2019-11-15
View all user reviews
Risk impact

Memento Time Travel is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Memento Time Travel if you trust the publisher.

Risk likelihood

Memento Time Travel has earned a fairly good reputation and likely can be trusted.

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