Examine source code of Asura

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Asura",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(36, 1, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(191, 191, 191)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(191, 191, 191)",
      "tab_line": "rgba(0, 0, 0, 0)",
      "popup": "rgba(44, 15, 15, 0.88)",
      "popup_text": "rgb(208, 208, 208)",
      "icons": "rgb(215, 215, 215)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(255, 0, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(184, 5, 0, 0.63)",
      "toolbar_field_focus": "rgba(48, 13, 13, 0)",
      "toolbar_field_highlight": "rgba(198, 198, 198, 0.22)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c11207d-4860-4827-bdd5-e0ff2d8aadad}"
    }
  }
}