<p dir="auto">Superset Version: <strong>0.36.0</strong></p>
<p dir="auto">The tooltip on the line chart in Firefox is not functional and not displaying any information.</p>
<p dir="auto">There seems to be <a href="https://github.com/apache/incubator-superset/issues/7822" data-hovercard-type="issue" data-hovercard-url="/apache/superset/issues/7822/hovercard">another issue</a> on this, but it is one year old and already closed.</p>
<p dir="auto">Chart(Pie, Bar, Line, etc.) tooltips not showing in Mozilla Firefox.</p>
<p dir="auto">In chrome and opera tooltips are working.</p>
<p dir="auto">Using apache superset - Master Branch</p>
<p dir="auto">Please see the image<br>
<a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/39004901/83641822-adbcd800-a5cb-11ea-9cc6-effab3e264fc.png"><img src="https://user-images.githubusercontent.com/39004901/83641822-adbcd800-a5cb-11ea-9cc6-effab3e264fc.png" alt="Screenshot 2020-06-03 at 6 50 27 PM" style="max-width: 100%;"></a></p>