Examine source code of Mossirox

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Mossirox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(103, 250, 92)",
      "tab_line": "rgb(112, 248, 117)",
      "popup": "rgb(121, 218, 120)",
      "popup_text": "rgb(41, 112, 9)",
      "tab_loading": "rgb(112, 248, 117)",
      "bookmark_text": "rgb(154, 248, 112)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(255, 255, 255)"
    }
  }
}