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This is the first several PRs to add some data to complete CSS reference pages. See mdn/sprints#3436 for details. I'll try to group these thematically, but they're mostly a random assortment, so there will be some one-offs, like this one.
-moz-float-edge
There are a number of very old mentions of this property in Bugzilla, several of which predate Firefox 1.0 (example). I found no evidence that it was supported in any other browser, at any time, under any name.