Frank Conijn

Thanks, but unfortunately, that Fiddle doesn't work anymore.

So then why does ytiurin reply that he had the HTML tag problem fixed, on https://github.com/ytiurin/hyphen/issues/22?

Even simpler: `if (Array.prototype.forEach) NodeList.prototype.forEach = Array.prototype.forEach;`?

@chris-morgan -- According to TJ Crowder on https://stackoverflow.com/a/46929259/2056165, after simplifying and debugging it per my suggestions, it should be: `if (typeof NodeList !== "undefined" && NodeList.prototype && !NodeList.prototype.forEach) NodeList.prototype.forEach =...

I'm afraid I don't have any suggestions, other than this: a whole new Firefox installation, followed by the CSS installation?

Thank you very much, Ranga! I didn't know that, but shall add that to the code.

Hey Ian, I should have written: "I shall add that to the instructions." Which I already did. See under 'Preparations before installation', item 3. The .css file stays the same.

That's odd. I'm afraid I don't know how what the cause of that is. Hopefully someone else will, at some point.