The gray text fetish is driving me nuts. This add-on is fast and generally effective. I have it set to 86 Minimum, 100 Maximum and 100 Edge. Some web pages are less readable with the settings and it that case you simply disable the add-on. I do not understand why someone else feels compelled to determine what constitutes readability for me, without any knowledge of my hardware or software or my visual acuity. This is a Godsend for me.