Format pages using the OpenDyslexic font and low contrast help. Open-Dyslexic is an open sourced font created to increase readability for readers with dyslexia.
Here are some more details about this add-on:
Your brain can sometimes do funny things to letters. OpenDyslexic tries to help prevent some of these things from happening. Letters have heavy weighted bottoms to add a kind of “gravity” to each letter. You are able to quickly figure out which part of the letter is down because of this feature. It aids in recognizing the correct letter, and sometimes helps to keep your brain from rotating them around. Consistently weighted bottoms can also help reinforce the line of text. The unique shapes of each letter can help prevent confusion through flipping and swapping.
Want to learn more? You can get OpenDyslexic from the Firefox Add-ons website.