Recent developments in machine learning and artificial intelligence has enabled very high-quality speech synthesis.

Some of the cloud-based voices may require additional in-app purchase to enable. Read Aloud allows you to select from a variety of text-to-speech voices, including those provided natively by the browser, as well as by text-to-speech cloud service providers such as Google Wavenet, Amazon Polly, IBM Watson, and Microsoft. Read Aloud is aimed at users who prefer to listen to content instead of reading, people with dyslexia or other learning disabilities, children learning to read, or simply to provide users with alternative way to consume web content. It works on a variety of websites, including news sites, blogs, fan fiction, publications, textbooks, school and class websites, online universities and course materials. Read Aloud is a Firefox extension that uses text-to-speech technology to convert webpage text to audio.

Supports EPUB (via the excellent EPUBReader extension). You can also set the pitch of the voice and the reading speed. You can choose from many available male and female voices. Tired of sitting, tired of reading? Click a button, jump on your bed, and have the article read aloud to you.

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