As of November 2010, Prism is listed as an inactive project at the Mozilla labs website.

[2] Prism is based on a concept called a site-specific browser (SSB).

[5] On February 1, 2011, Mozilla Labs announced it would no longer maintain Prism, its ideas having been subsumed into a newer project called Chromeless.

[6] However, the Mozilla Labs mailing list revealed that Chromeless is not in fact a replacement for Prism, and there is currently no Mozilla replacement for the out-of-the-box site-specific browser functionality of Prism, Chromeless instead being a platform for developers rather than users.

[7] For a while Prism continued to be maintained under the original name of WebRunner, which then also was discontinued in September 2011.