Earlier quoted context omitted.
As a web developer I don’t test in Chrome—I develop against Firefox and sanity check using Safari iOS. Therefore my site is explicitly optimised for Firefox. Chrome users might experience issues. Or they won’t. I have no idea.
Your "about" clearly states it: Some say I argue on the internet too much, but those people are wrong. I don't know what you do/sell on said websites, but if you still have a job it means that those who hired you haven't received (enough) complaints yet.
This might be due to Firefox users being more aware of standards than just "whatever runs on Chrome today", or because Google tends to ship non-standard behaviour with their browser and make it a "standard" with their massive marketshare. Or it might be related to Firefox developers implementing the standards more carefully in order to protect their shrinking marketshare.
In my experience people get way more complaints when the developer uses Chrome and the user uses Firefox than the other way around.