Recent bug with validation?

This is what I see right now when I try to upload new version of my add-on.

I do not understand what it even means. Seems like an internal bug on Mozilla’s side.

It’s complaining about the content_scripts declaration in your manifest.json. Specifically, it doesn’t like the value of the second content script object’s first matches value.

{
  ...
  "content_scripts": [
    { ... },
    {
      "matches": [
        ERROR_LOCATION
        ...
      ]
    }
  ],
  ...
}