I don't have a copy of Firefox handy to check, but IIRC the message in the inspector is a bit more descriptive. The message screenshotted in the article is a m

I don't have a copy of Firefox handy to check, but IIRC the message in the inspector is a bit more descriptive. The message screenshotted in the article is a message to the website visitor, not to the domain owner. And not going out of their way to shame Symantec to every visitor to a site with a Symantec cert is probably a decent policy. Even without their cert business, Symantec is a big player that the browser vendors will have to work with in the future.