It works perfectly. I'm really glad I took the time to set it up and I'm really glad the creator set it up for us.

My lone suggestion is to give us a quick toggle: either via being able to pin the extension button which right now can't be done -- so that single click on the button turns it on/off -- and/or a hotkey (probably ideal) that turns it on and off. I say this because in general most users will want to "exercise" by having it on, but turn it off for regular reading, and that may depend dynamically on each website, whether it fits the user's intention at that time or not (as well as how each website ends up looking given their css frames or the like.) Naturally the extension can be turned off through the general options one uses, but that takes more clicks, which is not quite ideal when we're trying to read and maintain a flow.

I appreciate that all the vowels and numbers have a colour, but what about the consonants? Is there a way to add that, on your end or mine, at least as an option?