cmd-shift-f inserts a Pandoc-style "
[^1]" footnote at cursor position, then adds a new line at the end of the file with the same reference, ready for pasting of the link (or any other footnote text)
After inserting the footnote,
cmd-shift-b places the cursor back in the body of the text, just after the initial reference. In other words, its a shortcut back to the place in the text body where you inserted the footnote, to save you the trouble of scrolling up for it from the end of a long document.
To remove the hassle of having to track footnote numbering across the file or between collaborators, each footnote uses a "unique" 4-character alphanumeric reference, i.e.
[^79d6]. When rendered by Pandoc, these will become sequentially numbered as normal.
The "unique" references are generated from an MD5 hash of two random numbers. 4 characters could, in theory, lead to collisions but this is highly unlikely in normal use.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.