Examine source code of just-just

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "just",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(250, 250, 250)",
      "toolbar_text": "rgb(61, 61, 61)",
      "frame": "rgb(245, 244, 242)",
      "tab_background_text": "rgb(46, 46, 46)",
      "toolbar_field": "rgb(250, 250, 250)",
      "toolbar_field_text": "rgb(64, 64, 64)",
      "tab_line": "rgb(250, 250, 250)",
      "popup": "rgb(250, 250, 250)",
      "popup_text": "rgb(61, 61, 61)",
      "button_background_hover": "rgb(245, 244, 242)",
      "ntp_background": "rgb(255, 255, 255)",
      "popup_border": "rgb(245, 244, 242)",
      "tab_selected": "rgb(250, 250, 250)",
      "tab_text": "rgb(5, 104, 115)",
      "toolbar_field_border": "rgb(245, 244, 242)",
      "toolbar_field_separator": "rgb(250, 250, 250)",
      "toolbar_top_separator": "rgb(245, 244, 242)",
      "tab_loading": "rgb(250, 250, 250)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{46b1bf93-a4a0-466c-9c2c-88b10045bfc2}"
    }
  }
}