Since it isn't mentioned this is inspired/based on https://bionic-reading.com/ (discussed in https://news.ycombinator.com/item?id=30787290). Note, although it has been granted patent only in France, the Bionic Reading name is registered trademark. A web extension was made soon after the link was posted and can be found in https://github.com/ahrm/chrome-fastread (Firefox vers: https://github.com/akay/firefox-fastread).