Examine source code of Material Dark for Firefox

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Material Dark For Firefox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(60, 60, 60)",
      "toolbar_text": "rgb(227, 227, 227)",
      "frame": "rgb(60, 60, 60)",
      "tab_background_text": "rgb(199, 199, 199)",
      "toolbar_field": "rgb(40, 40, 40)",
      "toolbar_field_text": "rgb(227, 227, 227)",
      "tab_line": "rgb(40, 40, 40)",
      "popup": "rgb(31, 31, 31)",
      "popup_text": "rgb(227, 227, 227)",
      "icons": "rgb(199, 199, 199)",
      "ntp_background": "rgb(60, 60, 60)",
      "popup_border": "rgb(87, 87, 87)",
      "sidebar_border": "rgb(87, 87, 87)",
      "sidebar": "rgb(43, 43, 43)",
      "tab_selected": "rgb(43, 43, 43)",
      "tab_text": "rgb(227, 227, 227)",
      "toolbar_bottom_separator": "rgb(87, 87, 87)",
      "toolbar_field_border": "rgb(40, 40, 40)",
      "toolbar_field_focus": "rgb(60, 60, 60)",
      "toolbar_field_highlight_text": "rgb(6, 46, 111)",
      "toolbar_field_highlight": "rgb(168, 199, 250)",
      "toolbar_field_text_focus": "rgb(227, 227, 227)",
      "tab_loading": "rgb(40, 40, 40)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74f350a9-ec2b-43ff-b6f6-f7e3457a8545}"
    }
  }
}