@Ted said:
@a_5mith, it used to do something, right?
Yeah it used to list all the plugins in npm and (I think) allow you to install them. But this was added to core a fair few versions back. Around 0.3 or 0.4. I hope that's the plugin I'm thinking of.
Looks like we should be using https://schema.org/breadcrumb instead anyways. These attributes only exist for search engine robots anyways, I don't know why Firefox is complaining.
