DSOL web application gives errors in firefox

[averbraeck]

When running in firefox, XML errors are given in the console. In Chrome, the animations run fine. The errors are in time.html and speed.html:

XML Parsing Error: syntax error
Location: http://127.0.0.1:8080/frame/time.html
Line Number 1, Column 3:

and

XML Parsing Error: syntax error
Location: http://127.0.0.1:8080/frame/speed.html
Line Number 1, Column 2:

[averbraeck]

This StackOverflow page might contain a solution: https://stackoverflow.com/questions/51000009/i-keep-getting-this-error-xml-parsing-error-syntax-error-but-still-the-website