Yes, Firefox has some issues. Yes, the Mozilla team needs to fix them. However, I think this article is being overly sensationalistic (surprise, surprise). In a wonderful bout of irony, the same forces that made long-standing IE users jump to FF are keeping them using FF. Some are averse to learning a new UI/control scheme, others needs certain extensions to remain productive. Then there are a few, like me, who don't see the performance/crashing issues that others report. I'm not saying that they don't exist, just that I haven't experienced them.
Additionally, FF has been approved for use in many businesses, as well as the DoD/DHS to run on their networks. Chrome, AFAIK, hasn't.
With these forces slowing down non-Firefox adoption, the Mozilla team has bought themselves some crucial time in the quest to right some of their browser's weaknesses. Hopefully they'll be able to meet that challenge, and, from reading the various blogs published to Planet Mozilla, I'm fairly confident that they will.