Examine source code of Blue Ocean Twilight

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Ocean twilight",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(48, 110, 162, 0.17)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(118, 132, 145)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(231, 225, 225)",
      "toolbar_field_text": "rgb(7, 7, 7)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(246, 241, 235)",
      "popup_text": "rgb(90, 93, 154)",
      "sidebar_text": "rgb(0, 0, 0)",
      "tab_background_separator": "rgb(235, 238, 232)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_field_highlight_text": "rgb(228, 235, 238)",
      "toolbar_field_separator": "rgb(251, 251, 248)",
      "toolbar_top_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{edc85493-cc8d-413a-84c3-866928c1bf79}"
    }
  }
}