Amazon said that its Kindle Cloud Reader, an HTML5 Web app, is now available on Mozilla's Firefox. With the move, Amazon's Web-based reader app is available on Google's Chrome, Apple's Safari (iPad and desktop) and Firefox.
In other words, Amazon just needs Microsoft's Internet Explorer and it will have most of its browser bases covered with the Cloud Reader.
Amazon's Reader HTML5 experiment is worth watching given that many observers ultimately expected the Web to replace mobile apps at some point. However, that replacement cycle could take years, but it's clear that publishers want to control their own app destiny and want to write once for multiple platforms.
The Kindle Cloud Reader will work on Firefox 6 and above, according to a statement.