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Chrome gives me the graph, and rich stock data. Firefox gives a minimum amount of data (vanilla install, no addons). See:

I get the same behavior for the people queries like "Barack Obama". (Android 14, Pixel 4a)

Because Google intentionally breaks it on non Chrome browsers so that you get a worse experience.

Install the Google Search Fixer from the Firefox add on store and it looks exactly the same.

I see the graph exactly like that in Firefox on Android.

edit: turns out I have the search fixer add-on that is mentioned in a sibling comment installed.