You might well be right, but I, along with lots of other firefox users run extensions like NoScript which blocks 3rd party javascript unless explicitly whitelisted, so I expect a much higher proportion of firefox users probably don't show up on analytics packages (which is how statcounter stats are generated). DuckDuckGo Privacy essentials plugin also blocks statcounter, as I'm sure do many other privacy related plugins.

Even if you are a firefox user who doesn't use third party plugins, firefox itself will block statcounter if you have enhanced tracking protection turned on. I couldn't find a similar setting in Chrome.

Unless you're spoofing your User-Agent string, servers still know what browser you're using. You don't need to be running client-side analytics scripts for browser market measurements.

Sure, but that's not how statcounter or most advanced analytics packages work.

Your browser doesn't make a request to the analytics server if you're blocking it, so while the content server might know the user agent, the analytics server generally doesn't.

I'd think it's a fairly safe bet that noscript users aren't a statistically significant part of total web users

The marketshare might not be great, but it's doing just fine technology-wise. No problem in "maintaining a working web browser" there.

Oh the tech in firefox is amazing, I'm just pointing out the marketshare is pretty lopsided for Chrome over Firefox.

It isn't as though there is actually a mass defection from Chrome to Firefox outside of a very small number of people.

How many people are 4.5% of the Internet though? Would you close a project because it only has a couple hundred million daily users? Would you cal it a failure?