Web Archives is a free Firefox extension designed to help users find archived and cached versions of web pages effortlessly. It allows searches to be initiated through various methods, including the context menu, browser toolbar, or directly from the address bar in the event of a server error. The extension supports a wide variety of archive and cache sources, which can be customized and organized according to user preferences. For more detailed information on supported search engines, users can refer to the project's wiki.

The extension offers multiple search modes to cater to different needs, including the default mode for searching the active tab and a custom URL search option. This functionality is not limited to Firefox, as Web Archives is also available for Chrome and Safari, making it a versatile tool for users across different platforms. Privacy-sensitive users can review the extension's privacy policy for further details.