One of the best and most useful add-ons for Firefox and reading in general. I installed it only today and I am loving it, I can't stop using it. I would only suggest adding a keyboard shortcut for selected text and maybe read "compu-ter" as a single unit instead of "compu-" and "ter" (which would help with word division at the end of a line in other languages as well). Kudos to the author for doing such a wonderful job.