Firefox share declined because the market objectively decided Chrome is a better browser. Framing it as Chrome "picking" on Firefox is just silly. And I say this as a die-hard Firefox user and fan.
You have no evidence to support this assertion. I know this because there is no objective "browser quality" standard. It is as least as likely that Google aggressively advertising it on every single page load of every single web presence gained traction for chrome.
Plenty of quality software is unpopular, and plenty of popular software is shit. I'm confident you know this. What is driving this series of pointless nonsense posts?