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Firefox UI UX history
(github.com)
A place to discuss the news and latest developments on the open-source browser Firefox
You can still do this in Waterfox, FYI.
I've not used Firefox in years (just various forks), specifically because of Mozilla's insistence on changing the UI and not allowing you to change it back.
I'd never thought of using Waterfox. Instead, most of my browsing is Pale Moon & SeaMonkey. Are there any good guides to making Waterfox look like a serious browser?