@VamptVo Really cool that you're doing this! Love it! If you do a follow-up, you may want to ask about Reader Mode. Personally, I don't use zooming (outside of pinch-to-zoom) all that much, but I make heavy use of Reader Mode in all my browsers, which I may or may not increase font size on.
@68kHeart Thanks! Reader Mode is less relevant for our Web usability purposes since we can’t do much to affect how it looks (which is a GOOD thing for users IMHO, considering how many sites refuse to give users control over styling).
I would, however, be interested in data from FF or Safari on Reader usage.