You suck at what you do. The idea of about:config flags is ridiculous. You do nearly nothing to improve users privacy and browsers defenses against fingerprinting.
You do not even have the basics (effective cookie control, user agent control, referrer control), which means your priorities are wrong and thus you will never achieve anything.
2. Selling telemetry data about users to evilcorps like google.
3. Ruining interface with project Australis (during the 3.6 > 4.0 update [status bar got removed], tab-bar got degraded).
4. Breaking XPCOM.
5. Implementing a system of stealth add-on installations.
The add-ons don't just get installed stealthily, they are also not listed by add-ons manager.
6. Pocket.
7. Using the system of stealth add-on installations to spy ('gather telemetry to improve users browsing experience') on users and adding ads.
Adding ads to the start page.
Nothing useful ever was deployed via the stealth add-on installation system.
8. Breaking users' preferences they set once.
9. Breaking XUL.
Mozilla is now even more malicious than Google.
Point 9 is the reason that firefox is dead to me since version 57: I will not update anymore and I'll have to switch my browser to a firefox fork because of that on holidays.
Oh, and all those issues - is just what is on the surface, the real problems are way deeper:
1. Mozilla rejects communication with users and developers.
2. Mozilla censors incoming messages.
3. Mozilla has betrayed the trust of its users by betraying its own ideals.
4. I thought Mike Beltzner (aka beltznebooth) was a dumb fucker that took stupid decisions, but turns out - he was the best of management Mozilla ever had: since he stepped away - the browser's degradation accelerated in supersonic speed.
5. Mozilla did too many mistakes and never acknowledged the failure, no conclusions were made, which means that the history to be repeated again and again.
> I don't want to be dismissive, just point out why what you or I want or believe is right, may not always be the best from the perspective of someone who has to decide for the product used by hundreds of millions of users.
There's also a simpler explanation (and following Popper's criterion - it's way more likely to be the actual reason): mozilla just decided to switch to total populism and now targets for amoeba-like users (that are an overwhelming majority) rather than power users (advanced, tech-savvy, where the share of users with 100+ tabs is higher than 10% compared to those ~0.01% among all users).
Why?
Because it's easier and because this way it will make higher profit (I know that MoFo is a non-profit, that never mattered anyways).