They also added this to their FAQ page:
"Iridium Browser is fully open source and does not use any proprietary
components. Check out the source code. [linked to their own Git repo]"
https://iridiumbrowser.de/faq
This meets FSF standards as long as all source code is available, under an
FSF-approved license. On this topic, the FAQ states:
"As the Iridium Browser is based on Chromium, the same license applies.
Chromium consists of many parts and each carries its own license. By entering
chrome://credits/ into the address bar, all components are listed and their
license can be viewed."
I guess Dave (or someone) will need to do this before the Iridium page can be
approved on the FSD.