I have had this add on for a while now and I have grown vary fond of it. To start It doesn't cause errors or crashes on websites, and so far i have been able to apply it anywhere. As many other reviews say, it is easy to use on long articles and it makes reading smother, faster, and cushy. It does what it is supposed to do. I recommend this to anyone, Especially to those with Dyslexia, ADD/ADHD, etc.