Examine source code of Darken-Nesios

{
  "description": "Thème sombre pour votre navigateur Firefox. ",
  "manifest_version": 2,
  "author": "Nesios",
  "name": "Darken",
  "version": "0.1.7",
  "homepage_url": "https://github.com/N3siOS/myMozillaTheme",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "background.png",
        "background__repeat.png"
      ]
    },
    "poperties": {
      "additional_backgrounds": [
        "left top",
        "right top"
      ]
    },
    "colors": {
      "frame": "#0D0C0C",
      "frame_inactive": "#0D0C0C",
      "tab_text": "#C4C4C4",
      "tab_line": "#606060",
      "tab_loading": "#E9E9E9",
      "tab_background_text": "#C4C4C4",
      "toolbar": "#202020",
      "toolbar_top_separator": "#0D0C0C",
      "toolbar_bottom_separator": "#0D0C0C",
      "toolbar_field": "#0D0C0C",
      "toolbar_field_text": "#C4C4C4",
      "toolbar_field_border": "#000000",
      "toolbar_field_border_focus": "#000000",
      "toolbar_field_focus": "#202020",
      "tab_background_separator": "#C4C4C4",
      "bookmark_text": "#C4C4C4",
      "icons": "#C4C4C4",
      "icons_attention": "#747D8B",
      "ntp_background": "#38383D",
      "ntp_text": "#E9E9E9",
      "popup": "#0D0C0C",
      "popup_highlight": "#0D0C0C",
      "popup_highlight_text": "#C4C4C4",
      "popup_text": "#E9E9E9",
      "sidebar": "#0D0C0C",
      "sidebar_highlight": "#38383D",
      "sidebar_highlight_text": "#0D0C0C",
      "sidebar_text": "#E9E9E9"
    }
  }
}