In the latest update on Windows 10 there are some features built into Edge that will help dyslexics. The first is the browser can read aloud and not read out code. Also words are highlighted as spoken.
Text to speech is the no1 feature that most dyslexics ask for. So that has given a powerful tool at no cost to the user. It should help Edge to be the browser of choice for Dyslexics.
Another useful feature is making use of Learning Tools to make the browser a more useful learning tool. By analysing the text for its component grammar elements it allows users to see what makes good writing.