Your first bullet point isn't mentioned in either of the links you provide.
It leads to this Acceptable Use Policy
https://www.mozilla.org/en-US/about/legal/acceptable-use/
"Upload, download, transmit, display, or grant access to content that includes graphic depictions of sexuality or violence,"
"You Are Responsible for the Consequences of Your Use of Firefox
Your use of Firefox must follow Mozilla’s Acceptable Use Policy, and you agree that you will not use Firefox to infringe anyone’s rights or violate any applicable laws or regulations.
You will not do anything that interferes with or disrupts Mozilla’s services or products (or the servers and networks which are connected to Mozilla’s services)."
Upload, download, transmit, display, or grant access to content that includes graphic depictions of sexuality or violence,
However, the Acceptable Use Policy only covers Mozilla's services, as mentioned at the very start of the document and further down. So I don't see how it covers the browser itself, as it is not a service.
[1]: https://www.mozilla.org/en-US/about/legal/acceptable-use/
"You Are Responsible for the Consequences of Your Use of Firefox
Your use of Firefox must follow Mozilla’s Acceptable Use Policy, and you agree that you will not use Firefox to infringe anyone’s rights or violate any applicable laws or regulations."
They can't be more clear than this. Acceptable Use Policy also applies to Firefox.
Indeed, and the AUP only covers Mozilla's services. In other words, you cannot use Firefox to upload porn to Mozilla's services. You can upload porn to OnlyFans or PornHub, as they are not one of Mozilla's services (yet anyway).
Particularly note that they say "Your use of Firefox must follow Mozilla’s Acceptable Use Policy" (emphasis mine) rater than for example "The terms of Mozilla's Acceptable Use Policy also applies to Firefox".
If it had said the latter I would certainly agree with you on this.