Brief 1.6.2 broke down in FF 15.01? Rated 4 out of 5 stars

Using FF 13 with Brief 1.6.2, suddenly all feed disappeared!!! How to fix it?
Thanks in advance

PS: is Brief development dead? In a near past, it was a featured extension. Now, it is not. Sign of decline?

This is the best reader by long. FF developer should take care of this addon.

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