Examine source code of Eastward

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Eastward",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(214, 61, 123, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(251, 217, 66)",
      "tab_background_text": "rgb(232, 34, 118)",
      "toolbar_field": "rgb(247, 232, 152)",
      "toolbar_field_text": "rgb(9, 21, 21)",
      "tab_line": "rgb(251, 217, 66)",
      "popup": "rgb(251, 229, 128)",
      "popup_text": "rgb(9, 21, 21)",
      "tab_selected": "rgb(72, 181, 176)",
      "tab_loading": "rgb(251, 217, 66)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9e32f62-6677-4842-a776-b4810d0edd32}"
    }
  }
}