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 don’t think so. The article claims Firefox lost some of its lead developers to Google when it started developing Chrome and then took a long time to regain its footing around 2017. That sounds about right to my recollection. I had admittedly switched to Chrome myself for a while (I’m not terribly tech-savvy, maybe a little more than average) but switched back to Firefox last year. I am still pretty deeply embedded in the Google ecosystem though in other ways.