Examine source code of simpliCT

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "simpliCT",
  "description": "Simple color theme for Firefox!",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(14, 19, 25)",
      "toolbar_text": "rgb(209, 209, 209)",
      "frame": "rgb(5, 8, 14)",
      "tab_background_text": "rgb(138, 135, 145)",
      "toolbar_field": "rgb(23, 32, 41)",
      "toolbar_field_text": "rgb(209, 209, 209)",
      "tab_line": "rgb(204, 180, 62)",
      "popup": "rgb(14, 19, 25)",
      "popup_text": "rgb(209, 209, 209)",
      "button_background_active": "rgba(109, 119, 124, 0.5)",
      "button_background_hover": "rgba(109, 119, 124, 0.3)",
      "icons": "rgb(209, 209, 209)",
      "ntp_background": "rgb(14, 19, 25)",
      "ntp_text": "rgb(209, 209, 209)",
      "sidebar_border": "rgb(138, 135, 145)",
      "sidebar_highlight_text": "rgb(209, 209, 209)",
      "sidebar_highlight": "rgba(109, 119, 124, 0.4)",
      "sidebar_text": "rgb(209, 209, 209)",
      "sidebar": "rgb(14, 19, 25)",
      "tab_loading": "rgb(204, 180, 62)",
      "tab_text": "rgb(209, 209, 209)",
      "toolbar_field_border_focus": "rgb(23, 32, 41)",
      "toolbar_field_focus": "rgb(23, 32, 41)",
      "toolbar_field_highlight_text": "rgb(221, 238, 238)",
      "toolbar_field_highlight": "rgba(109, 119, 124, 0.4)",
      "toolbar_field_separator": "rgb(138, 135, 145)",
      "toolbar_field_text_focus": "rgb(209, 209, 209)",
      "toolbar_vertical_separator": "rgb(138, 135, 145)"
    }
  }
}