Examine source code of Hargrimm

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Hargrimm",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-011-d53e0d0d1538ed554a90e056a2f04eca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(133, 159, 177)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(60, 88, 106)",
      "tab_background_text": "rgb(176, 189, 193)",
      "toolbar_field": "rgba(208, 228, 238, 0.75)",
      "toolbar_field_text": "rgb(0, 79, 109)",
      "tab_line": "rgb(172, 164, 150)",
      "popup": "rgb(220, 228, 230)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(75, 120, 135)",
      "button_background_hover": "rgb(94, 146, 162)",
      "icons": "rgb(15, 66, 125)",
      "popup_border": "rgb(255, 255, 255)",
      "tab_selected": "rgb(134, 164, 184)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(91, 147, 104)",
      "toolbar_top_separator": "rgb(134, 164, 184)",
      "tab_loading": "rgb(172, 164, 150)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ad1fe474-0c45-40ba-8afc-7fa37ccb6cfb}"
    }
  }
}