On mobile I'd suggest Fennec instead of stock Firefox since you can use add-ons without limitation, and don't need workarounds such as the Firefox nightly.
It's basically stock with enabled add-ons, and following the official release cycle with 2-3 days delay. Maintained by the original developers of the F-Droid store, so also a highly trustworthy source IMHO.
What report?
Edit: https://purl.stanford.edu/vb515nd6874
Somehow the link in the post is broken. Trying to share it copies the link. Weird.