Why firefox does not have deltarpm updates

Why Firefox does not have deltarpm downloads? When I try to upgrade Firefox from v97 to v98, it downloads full Firefox package. I tried to create a deltarpm between these two version to check savings and it came out with just 26mb.

Is there any reason for not providing drpm for firefox?

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The release engineering or infrastructure teams will have to answer this specific question but this recent thread will provide some general information on the state of deltarpms in Fedora:

https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/V5PJMCCRQH4LP6DIMA2TXACVUXHMVGD2/#V5PJMCCRQH4LP6DIMA2TXACVUXHMVGD2

And this pagure ticket that the thread links to:

https://pagure.io/releng/issue/7215

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Since there are no delta rpm for firefox, It looks like it better to download firefox directly from mozilla as it only updates whatever is need similar to delta rpm.
I don’t understand why Firefox package from fedora repo are larger than other distros. Inefficient compression?

fedora from fedora - 104 mB
firefox directly from mozilla - around 74 mB
firefox from arch linux repos - 62 mB
firefox debian - 55 MB.