For each of their builds, Debian has a bunch of privacy oriented patches, and
other idiosyncratic modifications necessary to the distribution. More at:

       https://sources.debian.org/patches/firefox-esr/115.14.0esr-1~deb12u1/

Builds from mozilla might not have those applied at all.

Cheers,
                 Ludovic

On Tue, 27 Aug 2024, Tom via Dng wrote:

>I was testing out the extrepo tool and noticed that they have a configuration for an official Mozilla apt repository https://packages.mozilla.org/apt, which contains an updated version 128 of the firefox-esr package.
>
>The repository setup process is documented on their support site at https://support.mozilla.org/en-US/kb/install-firefox-linux.
>
>Does anyone know what the differences are between the Mozilla firefox-esr package and the Debian firefox-esr package?
>
>Tom