And they really shouldn't. If you're not pissing off your power users you're not moving fast enough. The only user-stories that mass-market browser makers should care about are casual users browsing the web and software developers publishing to to the web.
Power users are a completely different market segment and have totally different needs and expectations from causal users.
This "strategy" will only drive the few remaining users away who actively decided to use Firefox while not winning any new "casual users" over (because those don't care about what differentiates Firefox from Chrome or Safari, they're all just web browsers after all).
But they're not moving fast enough, unfortunately. That's why there are a lot of new features available on Chrome that are not on Firefox, and that matters a lot for normal users because for them it's the browser that's broken, not the website.
Power users are a completely different market segment and have totally different needs and expectations from causal users.