For me the answer is quite simple: it's the only browser on iOS that lets you run Chrome extensions and Firefox add-ons.
Doesn't Firefox also run Chrome extensions? Not that Firefox doesn't have enough extensions by itself...
Firefox on iOS doesn't support extensions at all.
Firefox on any platform does not run Chrome extensions, because it is not built on Chromium.
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The underlying APIs are very similar, but you can't just install an extension from the Chrome Web Store.
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