(If you load those^ two PDFs in Firefox (PDF.js) and use the `>>` menu | `Document properties` entry, you can see that the Firefox result is `8.5 × 11 in (Letter, portrait)` while the Chrome result is `8.28 × 11.71 in (portrait)` which is roughly A4-sized.
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(If you load those^ two PDFs in Firefox (PDF.js) and check `Document properties` in the use the `>>` menu, you can see that the Firefox-generated PDF is `8.5 × 11 in (Letter, portrait)` while the Chrome-generated PDF is `8.28 × 11.71 in (portrait)` which is roughly A4-sized.
(If you load those^ two PDFs in Firefox (PDF.js) and check `Document properties` in the use the `>>` menu, you can see that the Firefox-generated PDF is `8.5 × 11 in (Letter, portrait)` while the Chrome-generated PDF is `8.28 × 11.71 in (portrait)` which is roughly A4-sized.)