Examine source code of gradient low

{
  "theme": {
    "images": {
      "theme_frame": "1gradient.png"
    },
    "colors": {
      "frame": "#00ff2f",
      "tab_background_text": "#00ff22"
    }
  },
  "version": "2.0",
  "name": "gradient low",
  "manifest_version": 2,
  "description": "gradient low"
}