Examine source code of Freedom Planet

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Freedom Planet",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(4, 0, 136)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 100, 151)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 255, 0)",
      "popup": "rgb(76, 76, 76)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(85, 153, 0)",
      "button_background_hover": "rgb(85, 153, 153)",
      "icons": "rgb(255, 204, 65)",
      "ntp_background": "rgb(95, 0, 0)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(255, 41, 0)",
      "popup_highlight_text": "rgb(255, 230, 179)",
      "popup_highlight": "rgb(164, 40, 0)",
      "tab_selected": "rgb(0, 68, 221)",
      "toolbar_bottom_separator": "rgb(0, 255, 0)",
      "toolbar_field_border": "rgb(85, 153, 153)",
      "toolbar_field_focus": "rgb(170, 170, 170)",
      "toolbar_field_highlight": "rgb(0, 0, 255)",
      "toolbar_field_separator": "rgb(255, 255, 255)",
      "toolbar_field_text_focus": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgb(0, 136, 255)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(0, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bb950eb2-a03a-4c35-8889-0c07f9bb5604}"
    }
  }
}