Examine source code of Mana sama

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mana sama love",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(174, 0, 183, 0)",
      "toolbar_text": "rgb(255, 194, 214)",
      "frame": "rgb(255, 0, 83)",
      "tab_background_text": "rgb(255, 194, 214)",
      "toolbar_field": "rgba(0, 0, 0, 0.31)",
      "toolbar_field_text": "rgb(136, 111, 187)",
      "tab_line": "rgb(82, 107, 154)",
      "popup": "rgb(0, 39, 45)",
      "popup_text": "rgb(133, 107, 183)",
      "tab_loading": "rgb(82, 107, 154)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c89a9b0a-955e-4fe4-abf0-1d949ae45c6a}"
    }
  }
}