Examine source code of Playver

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Playver",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-012-1e971c5fbb8dec3acbd76dd6c6819de9.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(233, 120, 135)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(255, 0, 38)",
      "tab_background_text": "rgb(255, 212, 215)",
      "toolbar_field": "rgb(237, 237, 237)",
      "toolbar_field_text": "rgb(153, 48, 207)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 106, 119)",
      "popup_text": "rgb(255, 205, 231)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{46892289-e118-4b70-a8d3-05244a0f67ed}"
    }
  }
}