for future readers — ironically, there were actually WIP patches to re-implement the XUL tree (nsITreeView) using an HTML5 canvas years ago

https://bugzilla.mozilla.org/show_bug.cgi?id=441414#c172

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  "What has been will be again,
  what has been done will be done again;
  there is nothing new under the sun."

—Ecclesiastes 1:9

"pining for a future that never arrived"

https://en.wikipedia.org/wiki/Mark_Fisher#Hauntology