Examine source code of Dark theme by Valou

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "Dark theme",
  "description": "Dark theme",
  "icons": {
    "1000": "logo.jpg"
  },
  "theme": {
    "images": {
      "theme_frame": "background.png"
    },
    "colors": {
      "frame": "#202225",
      "popup": "#292b2f",
      "popup_text": "#fff",
      "popup_highlight": "#3a3c42",
      "popup_highlight_text": "#fff",
      "toolbar": "#3a3c42",
      "toolbar_field": "#292b2f",
      "toolbar_top_separator": "rgba(0,0,0,0)",
      "toolbar_field_highlight": "rgba(255, 255, 255,0.9)",
      "toolbar_field_highlight_text": "rgba(0, 0, 0,0.9)",
      "toolbar_field_text": "#fff",
      "toolbar_field_focus": "#292b2f",
      "toolbar_field_border_focus": "#2196F3",
      "toolbar_vertical_separator": "rgba(255,255,255,0.2)",
      "toolbar_bottom_separator": "#202225",
      "tab_text": "#fff",
      "tab_line": "#202225",
      "tab_loading": "#2196F3",
      "tab_background_text": "#fff",
      "ntp_background": "#2e3035",
      "ntp_text": "#fff",
      "sidebar": "#292b2f",
      "sidebar_border": "#b9bbbe",
      "sidebar_text": "#fff",
      "icons": "#fff",
      "icons_attention": "#2196F3",
      "button_background_hover": "rgba(255,255,255,0.1)",
      "button_background_active": "rgba(255,255,255,0.2)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{934b3fe1-97a9-4156-a19a-88c234073fdb}"
    }
  }
}