Migrate Firefox Flatpak to Freedesktop 25.08 SDK+Runtime

[Jca]

The new Freedesktop 25.08 runtime has been available for quite some time now (see https://discourse.flathub.org/t/freedesktop-sdk-25-08-0-released/10399). As of about two weeks ago, Firefox is the only Flatpak installed on my system which still uses the old 24.08 runtime. It would be great to see the manifest at https://hg-edge.mozilla.org/mozilla-central/file/tip/browser/installer/linux/app/flatpak migrate to the new runtime. There are likely to be quite a few benefits from the new package versions and it would make the installation sizes a lot smaller for many users.

It is useful to note that the ffmpeg-full runtime has been replaced by codecs-extra now.

[Jon]

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