Uncaught ReferenceError in Microsoft Edge

The following error appears in Microsoft Edge which also prevents Plotly from rendering: ``` Uncaught ReferenceError: userPref is not defined at determineComputedTheme (main.min.js:1:87621) at main.min.js:1:88626 at NodeList.forEach (<anonymous>) at HTMLDocument.<anonymous> (main.min.js:1:88471) ``` Does not appear to affect Chrome.