Examine source code of Hoshigumi

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Hoshigumi",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(25, 25, 25)",
      "toolbar_text": "rgb(85, 180, 155)",
      "frame": "rgb(17, 17, 17)",
      "tab_background_text": "rgb(85, 180, 155)",
      "toolbar_field": "rgb(14, 32, 27)",
      "toolbar_field_text": "rgb(85, 180, 155)",
      "tab_line": "rgb(150, 199, 186)",
      "popup": "rgb(25, 25, 25)",
      "popup_text": "rgb(85, 180, 155)",
      "tab_loading": "rgb(150, 199, 186)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e56a0490-0524-4a6a-8af7-0b3c87688484}"
    }
  }
}