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What kind of BIOS/UEFI is used in Google Pixel devices?

After testing both Librewolf and Mullva Browser in coveryourtracks.eff.org it appears that Mullvad Browser conveys 15.4 bits of identifying information as compared with Librewolf, which has 17.72 bits.

When comparing with amiunique.org, both browsers are showing up as being unique.

Does Chromium offer similar bowser anti-fingerprinting measures as Librewolf or Mullvad Browser? It seems as though there is greater confidence from an exploit mitigation standpoint, but what about fingerprint resist features?

Do you know of any research looking at cell phone firmware? Has anybody taken apart the phones to check for an SPI chip and then reversed the firmware? I have seen this with desktop and laptops, but nothing for cell phone firmware; could be an interesting place to look.

Is there any relevant documentation on how GrapheneOS addresses firmware based supply chain attack vectors?

Is there an SPI chip on the board of a Google Pixel? Does it contain closed source or open source firmware?

Please see:

https://www.theregister.com/2023/05/11/bh_asia_mobile_phones/