Examine source code of Aprilbb

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Aprilbb",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(243, 229, 229, 0)",
      "toolbar_text": "rgb(106, 107, 117)",
      "frame": "rgb(243, 229, 229)",
      "tab_background_text": "rgb(106, 107, 117)",
      "toolbar_field": "rgba(245, 155, 179, 0.76)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(243, 229, 229)",
      "popup": "rgb(243, 229, 229)",
      "popup_text": "rgb(88, 132, 157)",
      "button_background_hover": "rgb(255, 255, 255)",
      "frame_inactive": "rgba(243, 229, 229, 0)",
      "icons": "rgb(106, 107, 117)",
      "ntp_background": "rgb(243, 229, 229)",
      "popup_border": "rgb(243, 229, 229)",
      "popup_highlight_text": "rgb(245, 155, 179)",
      "popup_highlight": "rgb(243, 229, 229)",
      "sidebar_border": "rgb(106, 107, 117)",
      "sidebar_highlight": "rgb(255, 255, 255)",
      "sidebar_text": "rgb(106, 107, 117)",
      "sidebar": "rgb(245, 155, 179)",
      "tab_background_separator": "rgba(243, 229, 229, 0)",
      "tab_selected": "rgb(243, 229, 229)",
      "tab_text": "rgb(88, 132, 157)",
      "toolbar_bottom_separator": "rgba(243, 229, 229, 0)",
      "toolbar_field_border_focus": "rgb(245, 155, 179)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_field_focus": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(88, 132, 157)",
      "toolbar_field_separator": "rgba(243, 229, 229, 0)",
      "toolbar_top_separator": "rgba(243, 229, 229, 0)",
      "tab_loading": "rgb(243, 229, 229)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{086bd366-eaa3-40b6-8a95-378d69593c7b}"
    }
  }
}