Relying on telemetry has been the biggest mistake developers decided to do in recent years. In the vast majority, only the most technically illiterate will keep telemetry enabled. For anyone with enough knowledge and two braincells to rub together, telemetry is an euphemism for spyware, so of course they'll do everything they can to disable it (also see all the Windows 10 "shut up" scripts, etc - people would rather run random scripts from the net than allow telemetry, even if doing the former isn't exactly that smart to begin with).

Relying on telemetry is heavily biased towards people who do not know what telemetry is.

Oh jees, is that what's happening? If they're only building for telemetry data, theyre screwed. Gonna end up with a browser for people who think the internet is a series of tubes.

You believe developers don't understand telemetry and leave it enabled because it helps development of the tools they use?

This whole anti-telemetry outrage is so manufactured and boring.

I'm a developer, and I disable telemetry whenever possible, including in Firefox. I do this because I value my privacy (the same reason I use Firefox), and I don't want my system to make network requests unnecessarily. The way I see it, there are two possibilities:

(1) A significant portion of Firefox users think like me. In this case, Mozilla should not rely on telemetry because it excludes a sizeable portion of their userbase, and one that likely correlates with things like "believes in Mozilla's stated core philosophy" and "is passionate enough about browsers to recommend them to people".

(2) Not many Firefox users think like me. In this case, it's pointless for me to enable telemetry because they'll just ignore my needs anyway. "It is not worth supporting this feature, the data shows that 99% of people do not use it!" won't change if the number is actually 98.99%.

That's like saying your vote doesn't matter so there's no point in voting.

It would be like saying that, if voting involved putting a machine in my house to report information about my daily activities to the government, and they used that data to attempt to determine which candidates and policies I would prefer without actually consulting me.

Check out https://addons.mozilla.org/en-US/firefox/addon/simple-tab-gr...

I was already a full-time Tree Style Tab user by the time FF4 Beta came around in 2010 so I'm probably part of the reason Panorama wasn't popular enough :p

There's enough space for both UIs. ;-)

More importantly, it seems both of them have survived the move to Quantum. It was really hard for me to imagine going without Panorama.