[ipaddr]

I don't think any of those issues you raised passes the bar. ffxsource.. no. The most trusted build. no many people build their own and it could be trusted more because someone is testing the official build and making changes and ensuring it works. The most trust Firefox Tech company is accurate. It implies many firefox tech companies exist and they are the best one.

[keane]

Take a look at Red Hat's guidelines, based on the open-source Model Trademark Guidelines (CC-BY-4.0), for comparison. They advise they consider it acceptable for you to claim "[Your brand] software is built from modified source code derived from Red Hat Enterprise Linux." However, without additional permission you cannot "Use the Red Hat Marks in a way that expresses or implies sponsorship or endorsement by, or affiliation or a relationship with Red Hat when one does not exist."

[0] https://www.redhat.com/en/about/trademark-guidelines-and-pol...

[1] http://modeltrademarkguidelines.org/index.php/Model_Trademar...