Google Dictionary - The Dictionary extension allows you to view definition easily as you browse the web.
Read Aloud - The Read Aloud extension uses text-to-speech technology to convert webpage text to audio.
Read & Write - The Read & Write extension offers support through text-to-speech and speech-to-text.
Announcify - The Announcify extension converts text-to-speech on any website.
Voice In Voice Typing- The Voice extension allows you to use speech-to-text to dictate in any textbox on any website.