Neither of those charts go back far enough because if they did you'd see this has all happened before, and even worse at one point. When IE was taking over the world FF fell to <5% of the market, yet it survived. It's not dead until its dead and with Chrome killing off ad-blockers I bet we'll see some reversal of the current trends when that ships.

When IE had taken over the world (~2002) Firefox did not exist yet, unless you include Netscape or Mozilla Suite

By the same reasoning, Internet Explorer should have killed off Firefox ages ago. Except that never happened and instead it is IE that died. Firefox has plenty of supporters and a rich development community; it won't go away any time soon.

There are enough of them to keep Mozilla going indefinitely and they are doing some truly amazing stuff like using Rust to get massive performance boosts. Mozilla and Firefox have set the agenda technically for close to two decades. Everybody does tabs now. I remember when that was a Mozilla only thing. Extensions were a Mozilla only thing for a long time now. Even Safari has extensions now. The new focus on security and privacy started at Mozilla and is now being copied by others (Brave, Edge, Safari) while Google is moving to kill ad blockers and continues to sell users out to their advertisers.

So what? Is it your mission to threadjack every story and turn it into a conversation about Firefox market share?

When you observe someone using Firefox do you interject, "You know that Firefox is dying, right?"

When you participate in meetings, do you open with "I'd like to state for the record that Firefox is doomed, doomed I say"?

At the coffee shop in the morning, do you order "Grande Mocha, hold the Firefox because all hope is lost"?