A web browser should display information FULL STOP. When the new HTML standard comes out, implement it. Until then just provide security fixes.
It's really not that hard or expensive (500 Million USD should be enough).
Stop changing the UI, adding crap that should be addons (that's why there's addons), adding adverts, adding spyware ("telemetry"), etc.
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Curiously all the Mozilla developers and apologists who are so enthusiastic about defending Firefox (and down voting critical comments) have taken the day off...