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Chrome's engine is built into Android, whereas the engine Firefox uses is not and thus has to be shipped with it.

I haven't looked at what Google does recently but you're likely getting most of Chrome in a separate package (e.g. the system WebView). Chrome and Firefox are of compareble size IIRC (56MB vs 65MB)

What's sad is they only support very few selected Add Ons.

Not sure if they will keep this edge given all the loss of talent.