Examine source code of Colorful_Invaders

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Invaders",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(26, 26, 26)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(5, 255, 0)",
      "tab_line": "rgb(255, 0, 4)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(172, 0, 255)",
      "button_background_hover": "rgb(100, 27, 135)",
      "icons_attention": "rgb(5, 255, 0)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(100, 27, 135)",
      "popup_border": "rgb(255, 241, 0)",
      "popup_highlight": "rgb(255, 255, 255)",
      "sidebar_border": "rgb(0, 138, 255)",
      "sidebar_highlight": "rgb(255, 255, 255)",
      "sidebar_text": "rgb(5, 255, 0)",
      "tab_loading": "rgb(255, 0, 4)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cbf6e038-7697-415f-afb7-f1197f4f51e6}"
    }
  }
}