Examine source code of Kerropi !!

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Kerropi !! ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(55, 130, 63)",
      "toolbar_text": "rgb(176, 44, 59)",
      "frame": "rgb(115, 214, 228)",
      "tab_background_text": "rgb(202, 23, 43)",
      "toolbar_field": "rgba(143, 228, 153, 0.53)",
      "toolbar_field_text": "rgb(202, 23, 43)",
      "tab_line": "rgb(28, 255, 0)",
      "popup": "rgb(195, 230, 192)",
      "popup_text": "rgb(209, 35, 54)",
      "ntp_background": "rgb(43, 42, 41)",
      "tab_loading": "rgb(28, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ddf31ea-ec5b-45e5-860f-318d37baf1d7}"
    }
  }
}