I used to use a browser extension to do this, mostly liked it until I tried to convert all my ebooks to it as well. It’s works, but it technically splits the words into two objects in order to change the font, which makes searching the book nearly impossible because typing a whole word will no longer find instances of it, instead you have to search for either half. Only an issue for ebooks, but it sort of turned me off of using this in general. Also I believe it’s “technically” copyrighted. I remember encountering something that wanted me to pay to use this. I found alternatives, but still, just left a bad taste in my mouth even though it helped. It did help me naturally read faster even without it, because rather than directly processing each letter I can do a sort of exclusion based search of my vocabulary as I process each letter. After 2 or 3, sometimes 4 letters, and with context I can correctly assume the rest of the word and move on.