Site does not render correctly with Shadow DOM on in FF 60.0.2

[jacrys]

I visited the site in FF 60.0.2 On Win10(Ver 1709 Build 12699.431) and was looking at the examples. I noticed that the StackBlitz samples were throwing errors:

After perusing the internet I found that FF has Web Components off by default so it turned them on, and tried again:

I assumed all was cool and went to the next sample, "Add Shadow DOM"... another error, it looks like shadow DOM is disabled as well:

After turning it on, I tried again, and it seemed to work fine,

until I refreshed.

The shadow DOM appeared to have wrecked a number of the UI components on the page, including the social icons, which are now about 2 inches tall (links included for scale):