I just tried this out in Firefox on macOS and there are no issues, so this might have something to do with our LetsEncrypt wildcard cert and the CA roots installed on Android. Could you tell me what version of Android you are using?
Moto g stylus 2025 - Android 15 - metro by T-Mobile stock os
Firefox nightly
148.01a
I'll check for updates
Edit: still broken
148.0a1 (Build #2016134322), 757b8230f44e4152aeb7b9031ff95219471ab993 GV: 148.0a1-20251226204324 AS: 148.20251224050247 OS: Android 15
Edit: also same on OnePlus Nord N30
147.0b7 (Build #2016133535), 455e50920c4926534376b719df4cf1ed714bc61d GV: 147.0-20251222164020 AS: 147.0 OS: Android 14
Moto g stylus 2025 - Android 15 - metro by T-Mobile stock os
Firefox nightly
148.01a
I'll check for updates
Edit: still broken
148.0a1 (Build #2016134322), 757b8230f44e4152aeb7b9031ff95219471ab993 GV: 148.0a1-20251226204324 AS: 148.20251224050247 OS: Android 15
Edit: also same on OnePlus Nord N30
147.0b7 (Build #2016133535), 455e50920c4926534376b719df4cf1ed714bc61d GV: 147.0-20251222164020 AS: 147.0 OS: Android 14