Examine source code of CopperDeckInspired

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "CopperDeckInspired",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(76, 76, 76)",
      "toolbar_text": "rgb(246, 179, 148)",
      "frame": "rgb(53, 53, 53)",
      "tab_background_text": "rgb(246, 179, 148)",
      "toolbar_field": "rgb(53, 53, 53)",
      "toolbar_field_text": "rgb(246, 179, 148)",
      "tab_line": "rgb(247, 201, 179)",
      "popup": "rgb(53, 53, 53)",
      "popup_text": "rgb(246, 179, 148)",
      "button_background_active": "rgb(106, 79, 65)",
      "button_background_hover": "rgb(90, 90, 90)",
      "icons_attention": "rgb(246, 179, 148)",
      "tab_loading": "rgb(247, 201, 179)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{294d8f78-98a0-4797-b77e-3dfea5f3d231}"
    }
  }
}