Screen recording showing the problem: watch how the text in the table cell flips around when the footnote is inserted. Inspecting the document with DevTools confirms that the problematic CSS rule (as described in comment 2) is still being inserted.
Bug 994306 Comment 6 Edit History
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Screen recording showing the problem: watch how the text in the table cell flips around when the footnote is inserted (at about 0:26 in the recording). Inspecting the document with DevTools confirms that the problematic CSS rule (as described in comment 2) is still being inserted.