Citation needed. I've been using for a while and it is leaps and bounds better than what it was. I haven't fired up Chrome in months now.
The first two points haven’t been true for years and the second is debatable - Firefox’s tracking protection certainly seems to be more effective.
The problem for Mozilla is that this doesn’t matter enough: Firefox feels faster than Chrome, but both are fine in normal use and your web browsing experience will be most affected by the site you’re using needing a ton of JavaScript rather than the browser. Similarly, their developer tools have a bunch of nice features but the developer experience is pretty decent in every browser so it’s not a distinguishing factor the way it used to be.
Browsers have been commodified and that’s the core of Mozilla’s business while Google has a ton of ad revenue to support Chrome no matter what happens.
The one thing that could save it, Servo, doesn't seem to be a priority. Instead, Mozilla seems to be focusing on offering cloud services that nobody wants or cares about, which also don't really respect privacy any more than other cloud services. The only significant revenue stream Mozilla has is through Firefox, which keeps steadily losing users and market share.
And even that is almost entirely dependent on people using Google search with the browser. Given that Google is Mozilla's primary competitor who has intentionally broken their apps on Firefox and is pushing them down in search results, and that Firefox is marketing itself to privacy-conscious people who wouldn't use Google anyway, it doesn't seem wise or sustainable at all.
Unless things seriously change, I have no faith that they'll be able to turn this situation around. We may just have to live with a Blink/WebKit web monoculture until we get some serious anti-trust legislation.