Examine source code of Platformer Quest (Animated)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Platformer Quest (Animated)",
  "description": "An auto-playing pixel platformer Firefox theme. A knight runs, leaps over slimes and grabs coins across a seamless, looping side-scrolling world—like the attract-mode demo of a classic console game.",
  "browser_specific_settings": {
    "gecko": {
      "id": "platformer-quest@theme.local"
    }
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/platformer.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "frame": "rgb(99, 179, 235)",
      "frame_inactive": "rgb(120, 192, 240)",
      "toolbar": "rgba(0,0,0,0)",
      "toolbar_text": "rgb(30, 46, 30)",
      "toolbar_field": "rgba(0,0,0,0)",
      "toolbar_field_text": "#1c2b14",
      "toolbar_field_border": "rgba(0,0,0,0)",
      "toolbar_field_focus": "rgba(255, 255, 255, 0.92)",
      "tab_background_text": "rgb(28, 46, 26)",
      "tab_text": "#143a14",
      "tab_selected": "rgba(120, 220, 120, 0.85)",
      "tab_line": "#4caf2a",
      "tab_loading": "#ffcc00",
      "tab_background_separator": "rgba(0, 0, 0, 0)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "toolbar_bottom_separator": "rgba(0,0,0,0)",
      "toolbar_vertical_separator": "rgba(0, 0, 0, 0)",
      "popup": "#bfe9ff",
      "popup_text": "#1c2b14",
      "popup_border": "#4caf2a",
      "popup_highlight": "#ffcc00",
      "popup_highlight_text": "#1c2b14",
      "icons": "rgb(30, 46, 30)",
      "icons_attention": "#e8431f",
      "ntp_background": "#bfe9ff",
      "ntp_text": "#1c2b14",
      "sidebar": "#d6f0ff",
      "sidebar_text": "#1c2b14",
      "sidebar_border": "rgba(60, 140, 60, 0.3)"
    }
  }
}