On macOS, pressing up on the first line of an editor should move the caret to the start of the line. In Fire it does nothing (the caret stays where it is).
I think this is a bug.
First i hear of this, but it looks like you’re right. will fix.
Done 
I’ve uploaded a new build with this fix and the one form the other thread, to Personal Downloads for you.
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Awesome customer service as usual!
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Just checked - all fixed 
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