Examine source code of Rem animated

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Rem animated",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(125, 95, 253)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(11, 11, 11)",
      "toolbar_field_text": "rgb(74, 109, 249)",
      "tab_line": "rgb(125, 95, 253)",
      "popup": "rgb(27, 25, 30)",
      "popup_text": "rgb(251, 251, 251)",
      "tab_loading": "rgb(125, 95, 253)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b0166187-d650-45e2-9c22-8cdbdcc77730}"
    }
  }
}