I am glad that the screen shot helped.
Incidentally, my Mac records screen shots as PNGs but I had to re-save it as a JPG before my NG Gallery would show it.
It might be useful if Galleries could accept PNGs?
But
only when you have nothing else to do!

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I have just taken a look at the equivalent FireFox notice for my own site and I spot a difference in the "Verified By:" entries.
Mine says:
Verified by: letsencrypt (the company which provided my certificate);
but the equivalent entry on the NG site says:
Not Specified.
That might be why FF reports it as "Encryption Broken"?