Swapping the order when exporting the flavors to the clipboard, [here](https://searchfox.org/mozilla-central/rev/927e525f481a93a8f63d27a78ae6201e42b1b1fb/dom/base/nsCopySupport.cpp#456,482,491) might fix the problem. Will give it a try.
Bug 1689992 Comment 3 Edit History
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Swapping the order when exporting the flavors to the clipboard, [here](https://searchfox.org/mozilla-central/rev/927e525f481a93a8f63d27a78ae6201e42b1b1fb/dom/base/nsCopySupport.cpp#456,482,491), might fix the problem. Will give it a try.