Article seems pretty flawed. Relevance is a vague metric, and the author relies pretty heavily on data related to government site visitation, which seems subject to bias toward certain types of users.
Market share is likely still incredibly low, but Firefox’s relevance should be spiking right now due to Google’s shenanigans with Chromium. The fact that like 90% of revenue for its for-profit wing is from Google is still troubling.
Any alternative views out there?
I always spoof the ua. Not for privacy (though it helps), but because some sites artificially break for certain browsers or OSs and work perfectly fine when they think you’re on a different browser. The artificial restriction should be illegal, but it isn’t.