Fire Vox is an open source, freely available talking browser extension for the Firefox web browser. Think of it as a screen reader that is designed especially for Firefox.
In addition to the basic features that are expected of screen readers, such as being able to identify headings, links, images, etc. and providing navigational assistance, Fire Vox provides support for MathML and CSS speech module properties. It also works on Windows, Macintosh, and Linux.
Fire Vox is designed to accommodate different users with different needs. For visually impaired users, all Fire Vox commands are keyboard activated. In addition, the keyboard commands can be easily reconfigured in the self-voicing Fire Vox Options menu to avoid conflicts with other accessibility software products or to suit personal preferences. For sighted users who need a screen reader, such as web developers interested in testing their webpages or educators who work with visually impaired students, Fire Vox's highlighting feature makes it easy to keep track of where it's reading from on a page. This highlighting feature is also useful for dyslexic users and partially sighted users.
Because Fire Vox works directly within the Firefox browser, it always provides users with a live view of the web page, rather than a frozen snapshot which is what many other screen readers provide. This means that Fire Vox has the ability to handle dynamic pages better.
Click this link to learn more about the Fire Vox extension for Firefox.