Incubator-superset: Line Chart tooltips in Firefox not showing

[klazaj]

Superset Version: 0.36.0

The tooltip on the line chart in Firefox is not functional and not displaying any information.

There seems to be another issue on this, but it is one year old and already closed.

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[Pinimo]

I've been encountering the same problem for the last months, it would be nice to get this fixed soon. I'm enclosing @klazaj's snapshot from Slack.

Left: Firefox; right: Chrome

[Pinimo]

This is a duplicate of #9976

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