[Plugin: Network Publisher] API Key Won't Add, in Firefox OR Chrome

I installed the plugin but it won’t accept the API key. The page link for “Errors? click here” is gone, and upon looking around the publisher’s site, I found a simple and dismissive, “That’s a browser issue; try using Chrome or Firefox.” Firefox is my default browser, but I tried it in Chrome as well, and it still won’t accept the key.

Too bad. I’ve voted “broken.”