Examine source code of Breakfast now!

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Breakfast time!",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(204, 222, 235, 0.25)",
      "toolbar_text": "rgb(0, 153, 190)",
      "frame": "rgb(210, 33, 11)",
      "tab_background_text": "rgb(0, 123, 220)",
      "toolbar_field": "rgb(255, 248, 236)",
      "toolbar_field_text": "rgb(128, 63, 0)",
      "tab_line": "rgb(231, 186, 41)",
      "popup": "rgb(251, 251, 223)",
      "popup_text": "rgb(181, 89, 0)",
      "tab_loading": "rgb(231, 186, 41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{36e8fc02-f610-45f4-9cd9-a08c8db82d04}"
    }
  }
}