Examine source code of Blocks

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blocks",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(22, 23, 23)",
      "toolbar_text": "rgb(112, 160, 248)",
      "frame": "rgb(22, 131, 196)",
      "tab_background_text": "rgb(34, 58, 105)",
      "toolbar_field": "rgb(35, 48, 55)",
      "toolbar_field_text": "rgb(104, 152, 255)",
      "tab_line": "rgb(40, 48, 57)",
      "popup": "rgb(6, 6, 6)",
      "popup_text": "rgb(98, 114, 183)",
      "ntp_background": "rgb(11, 16, 37)",
      "tab_loading": "rgb(40, 48, 57)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{51d24703-0c00-4e6a-a2c5-a7e804e699d6}"
    }
  }
}