How to open multiple Kindle books at the same time?
I haven't tested this specifically with Kindle, but it works for most apps that don't normally open a second instance...
In Terminalopen -n
(note the space after -n)
then drop the Kindle app onto the Terminal window to auto-fill the path to it & hit Return⏎
back in Terminal, Opt ⌥ ↑ then Return⏎ will repeat that command & should open a second instance.