Examine source code of Cimento

{
  "manifest_version": 2,
  "version": "3.6",
  "name": "Cimento",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(41, 41, 41)",
      "toolbar_text": "#92a991",
      "frame": "rgb(58, 50, 46)",
      "tab_background_text": "rgb(121, 106, 100)",
      "toolbar_field": "#3a322e",
      "toolbar_field_text": "rgb(164, 164, 164)",
      "tab_line": "#92a991",
      "popup": "rgb(249, 249, 251)",
      "popup_text": "rgb(21, 20, 26)",
      "button_background_active": "rgb(65, 65, 65)",
      "button_background_hover": "rgb(88, 55, 43)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "#92a991",
      "popup_border": "rgb(207, 207, 216)",
      "popup_highlight_text": "rgb(21, 20, 26)",
      "popup_highlight": "rgb(224, 224, 230)",
      "sidebar_border": "rgb(207, 207, 216)",
      "sidebar_highlight_text": "rgb(21, 20, 26)",
      "sidebar_highlight": "rgb(224, 224, 230)",
      "sidebar_text": "rgb(21, 20, 26)",
      "sidebar": "rgb(249, 249, 251)",
      "tab_loading": "rgba(255, 255, 255, 0.22)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "#92a991",
      "toolbar_field_border": "#26211e",
      "toolbar_field_focus": "#141414",
      "toolbar_field_highlight_text": "#423c3b",
      "toolbar_field_highlight": "#92a991",
      "toolbar_field_text_focus": "rgb(199, 199, 199)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb1dfd7c-f207-4cb8-a967-cb4e2bd8dc07}"
    }
  }
}