Examine source code of Placebo Cold

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#575757",
      "tab_background_text": "#383838"
    }
  },
  "version": "2.0",
  "name": "Placebo Cold",
  "manifest_version": 2,
  "description": "Theme for coldlight to match the grey"
}