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Results from the Browser Features Survey
(connect.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
To be fair, I imagine an entire browser just like that for a long time. You have your settings and every website would look the same. A default frontend for everything. No Javascript, just the content.
Ah, yes, the Web as it was intended to be, with semantic markup and separate presentation/styling that the user was not only able, but encouraged by design, to override as he saw fit.
I've spent pretty much my entire adulthood being low-key pissed off about how that got thoroughly and comprehensively fucked as soon as the marketing fuckwads got their hands on the Web.