Examine source code of N theme

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "N theme",
  "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": "rgb(255, 255, 255)",
      "frame": "rgb(16, 16, 16)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(57, 57, 57)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(48, 48, 48, 0)",
      "popup": "rgb(57, 57, 57)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(21, 21, 21)",
      "popup_border": "rgba(255, 0, 0, 0)",
      "tab_background_separator": "rgba(255, 0, 4, 0)",
      "toolbar_bottom_separator": "rgba(0, 0, 255, 0)",
      "toolbar_field_border_focus": "rgb(10, 132, 255)",
      "toolbar_field_border": "rgba(0, 0, 255, 0)",
      "toolbar_field_focus": "rgb(57, 57, 57)",
      "toolbar_field_highlight": "rgb(10, 132, 255)",
      "toolbar_field_separator": "rgba(255, 0, 4, 0)",
      "toolbar_top_separator": "rgba(37, 37, 37, 0)",
      "toolbar_vertical_separator": "rgba(37, 37, 37, 0)",
      "tab_loading": "rgba(48, 48, 48, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e73f520-c033-4eab-a5c0-b26ed4356dd3}"
    }
  }
}