Are there web browsers that have been developed specifically for use by people with disabilities?

Yes, there are many web browsers that include special features for use by individuals with disabilities.

For more information on some of these features consult Better Web Browsing: Tips for Customizing Your Computer, which is a site that provides references to resources that help you customize your particular web browser and computer setup, and How People with Disabilities Use the Web, which includes a page that introduces some of the hardware and software innovations and approaches that people with disabilities use to browse and interact with the Web.