Examine source code of stealthfield

{
  "manifest_version": 2,
  "version": "3.1",
  "name": "stealthfield",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/stealthfield.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(9, 9, 9, 0.5)",
      "toolbar_text": "rgb(244, 244, 234)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(244, 244, 234)",
      "toolbar_field": "rgba(12, 12, 12, 0.5)",
      "toolbar_field_text": "rgb(244, 244, 234)",
      "tab_line": "rgb(236, 28, 35)",
      "popup": "rgb(9, 9, 9)",
      "popup_text": "rgb(236, 28, 35)",
      "tab_selected": "rgb(236, 28, 35)",
      "tab_loading": "rgb(236, 28, 35)"
    }
  }
}