Firefox started at 0% when IE was more dominant than Chrome is today. Nothing is certain.
Firefox hit a peak of 32% and has fallen ever since. Effectively Firefox crashed at the same time IE did, and I can’t see in what way Mozilla ever attempted to recover.
Now correlate that with when the organization was hijacked by its management into no longer being interested in making a good browser.
What the heck are you talking about? This is from the Thunderbird group not the firefox group...