Examine source code of Office Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Office Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-011-d53e0d0d1538ed554a90e056a2f04eca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(209, 219, 226)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(73, 153, 201)",
      "tab_background_text": "rgb(248, 248, 248)",
      "toolbar_field": "rgb(224, 237, 252)",
      "toolbar_field_text": "rgb(26, 22, 22)",
      "tab_line": "rgb(26, 26, 26)",
      "popup": "rgb(233, 237, 240)",
      "popup_text": "rgb(23, 122, 173)",
      "tab_loading": "rgb(26, 26, 26)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{37ef25b2-eb11-4349-86b6-1ed6349c624b}"
    }
  }
}