Examine source code of Artificer - Engineer

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Artificer - Engineer",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(40, 40, 40)",
      "toolbar_text": "rgb(151, 151, 151)",
      "frame": "rgb(25, 25, 25)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(96, 96, 96)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(252, 99, 0)",
      "popup": "rgb(252, 99, 0)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(252, 99, 0)",
      "tab_selected": "rgb(252, 99, 0)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(252, 99, 0)",
      "toolbar_field_focus": "rgb(252, 99, 0)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(116, 116, 116)",
      "toolbar_field_text_focus": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgb(252, 99, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6b53cab6-41de-4866-a3fd-dbde1e13d1de}"
    }
  }
}