Examine source code of Budgies

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Budgies",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(244, 255, 107)",
      "toolbar_text": "rgb(108, 255, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(190, 255, 0)",
      "toolbar_field": "rgb(142, 116, 75)",
      "toolbar_field_text": "rgb(0, 217, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(144, 238, 255)",
      "popup_text": "rgb(172, 161, 109)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c28a066b-1aa1-4295-ad6e-5208aabdf6fb}"
    }
  }
}