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At minimum, it’s a sliding scale rather than binary and iOS browsers are less Safari reskins than Chromium-based browsers (most of which share a much higher percentage of code) are Chrome reskins. There’s exceptions like Arc which uses a bespoke AppKit/SwiftUI/WinUI UI instead of the standard Chromium stuff but that’s pretty rare.
This doesn't matter as long as essential features of Firefox aren't allowed by Apple.
... which is the most important Firefox extension.