Examine source code of Animated│Asteroids

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Animated│Asteroids",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center",
        "right center",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 84, 90, 0.2)",
      "toolbar_text": "rgb(178, 185, 185)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(178, 185, 185)",
      "toolbar_field": "rgba(0, 0, 0, 0.5)",
      "toolbar_field_text": "rgb(178, 185, 185)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(0, 17, 18)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(0, 99, 108, 0.25)",
      "button_background_hover": "rgb(0, 99, 108)",
      "icons_attention": "rgb(0, 245, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(178, 185, 185)",
      "popup_border": "rgba(0, 245, 255, 0.2)",
      "popup_highlight": "rgba(0, 245, 255, 0.25)",
      "tab_loading": "rgb(0, 245, 255)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(0, 17, 18)",
      "toolbar_field_border_focus": "rgba(0, 84, 90, 0.2)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgb(0, 17, 18)",
      "toolbar_field_highlight": "rgba(0, 245, 255, 0.5)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cccb4694-6d82-4697-81bd-f910dd310f07}"
    }
  }
}