Examine source code of FireDEV

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "FireDEV",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(7, 16, 51, 0)",
      "toolbar_text": "rgb(0, 218, 255)",
      "frame": "rgb(1, 15, 62)",
      "tab_background_text": "rgb(155, 200, 218)",
      "toolbar_field": "rgba(7, 16, 51, 0)",
      "toolbar_field_text": "rgb(82, 215, 251)",
      "tab_line": "rgb(0, 125, 230)",
      "popup": "rgba(12, 17, 42, 0.52)",
      "popup_text": "rgb(89, 219, 252)",
      "button_background_hover": "rgba(89, 231, 255, 0.61)",
      "icons_attention": "rgba(12, 16, 42, 0.69)",
      "ntp_background": "rgb(1, 15, 62)",
      "popup_border": "rgb(64, 206, 250)",
      "tab_selected": "rgba(43, 84, 81, 0.54)",
      "toolbar_field_separator": "rgba(252, 8, 39, 0)",
      "toolbar_top_separator": "rgba(252, 8, 39, 0)",
      "toolbar_vertical_separator": "rgba(252, 8, 39, 0)",
      "tab_loading": "rgb(0, 125, 230)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9d6ad557-3f35-4751-aab6-07a31f913d0c}"
    }
  }
}