Dashboards app doesn't work on Firefox 52.0 ESR

[svetoslavkolev]

I have tried to run the sample app and it was successful on recent Chrome and Firefox versions, but the app doesn't load on Firefox 52.0 ESR. Do I miss something?
I didn't changed anything in the code, just have ran the commands for rollup, build and serve.
The mentioned Firefox version can be downloaded from here: https://ftp.mozilla.org/pub/firefox/releases/52.0esr/