11: It's the only browser on the market that is not either apple webkit or google chrome based. And it's in our best interest to keep said market healthy, with as many competing actors as possible.
Microsoft is the king of blowing a massive, industry-defining market lead in the fourth quarter due to unforced errors. Especially in the 21st century:
They were the default office suite, to the point where their trademark became the category name, and they even had SharePoint; but their stubborn refusal to get into the cloud document game handed off the top spot to Google Docs.
They were the king of K12 education by default, since Apple was so expensive and essentially the only factor that matters in K12 is price. Then they completely ignored Google offering really good deals on Chromebooks for a decade or more, and now Chrome OS is the dominant K12 platform.
They owned Skype, which was genericized as the popular verb meaning "to make a video call." But they ignored the opportunity that was the pandemic, and Zoom not only ate their lunch but took the genericized trademark crown.
They had Lync, which was the de facto messaging app that every Enterprise deployment used. But then they didn't update the app for a decade except to change the name to Skype for Business and then to Teams, while Slack ate their lunch.
And, as you mentioned, they had the top browser for both users and developers, but did nothing with it until Chrome got unattainably faster, easier to use, and more standards-compliant.
Xbox was never the singular market leader like these other things—they've always played ping-pong with PlayStation—but Microsoft owns Rare, an industry defining studio, and they've completely wasted them for years.
They never had dominance in the smartphone world, but they were poised for it with a well-liked and visually distinct platform in Windows Phone which they just abandoned.
To a certain extent, they had a sort of "goodwill dominance" in their operating system, which they frittered away on automatic updates and design overhauls and (more recently) AI that nobody was asking for.
They lost all these massive leads while they were chasing dominance in search, or video game livestreaming, or AI, or whatever. They always seem to be focusing on the thing that doesn't matter while their dominance just flutters away in the wind.
It's in their DNA. They completely missed the internet boat when it first took off in the early 2000s and played catch-up for years thereafter. You would think they would have learned and not made the same mistakes again that you have in your list, but nope. Maybe they were too busy fighting Linux.
This is not true. Firefox is not the only browser that's not based on Webkit.
There's Iceweasel, Waterfox, Pale Moon, Seamonkey and Librewolf. That they have a negligible portion of the market is one thing. But they're on the market, dammit!
There's a new feature inside Firefox that allows you to report webpages that are broken on Firefox but work in other browsers. Please use it. It's a great way to push for universal compatibility within browsers. It's usually the webpage developer's fault for using a non-orthodox technique that works exclusively on Chrome, but shouldn't be done for any sort of reasons, like compliance with web standards. But, it's possible for Firefox to derive intelligence from the reports and write workarounds.
If websites don't work on Firefox even if the user agent was changed to Chrome I recommend you to use a privacy preserving browser like ungoogled chromium.
Easiest would be to install a plugin such as "User-Agent Switcher." This is the string of text that identifies what browser, version, and platform you're running to the server you're accessing.
It's a string that your browser sends to websites with information about the browser itself and your OS. Sometimes that info will be used to block functionality.
Years ago I tried to use TurboTax from Firefox on Ubuntu. It wouldn't work because only Internet Explorer on Windows was supported. I changed the user agent to make it appear as though I was using a supported setup, and it worked flawlessly.
I haven't actually needed to use one in a long time, but an extension search for "user agent switcher" should turn up something that can do it.
But people still aren't getting it (despite increasingly obvious signs this is already causing problems that will soon get much worse), so I guess we need to keep saying it
I definitely get less sneers these days when I talk about things like this
Hell, you know what - I'm going to double down on your bright side - if the enshitification wasn't so public and rapid, it might've been too late before normal people started noticing