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The best part is despite all the shit they've gotten for telemetry, they didn't have any metrics to justify this, just a product managers hunch. They've put in metrics now, now that they've hidden the menu option so nobody not gone out of their way to look for it can turn it on, so likely nest year they'll use it to justify killing it for real.

Because an option visible in the UI that nobody is using is visual clutter. You still have it hidden in about:config as you say.

It was not visible in the UI before. It was very hard to find, which is probably why not many people are using it.

> Why is that even a metric for a browser UI?

Because they need to know where to focus their efforts.

I'm not familiar with how Firefox UI works. Would it require a non-trivial amount of work to maintain a compact theme? I'm assuming it's some form of style sheet and they share assets like icons.

A developer said the compact theme isn't much work as long as they have to maintain the touch theme.