Examine source code of Plain Black - Red Text

{
  "theme": {
    "images": {
      "theme_frame": "plainblacktopbar.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ed0000"
    }
  },
  "version": "2.0",
  "name": "Plain Black - Red Text",
  "manifest_version": 2,
  "description": "just a plain black with red text, that's it."
}