Examine source code of Dark Mode

{
  "manifest_version": 2,
  "name": "Dark Theme Tabs",
  "version": "1.2",
  "description": "A more ergonomic and comfortable interface for your eyes.",
  "theme": {
    "colors": {
      "bookmark_text": "#F1F1F1",
      "frame": "#000000",
      "tab_background_text": "#FFFFFF",
      "tab_line": "#00FF00",
      "tab_loading": "#00FF00",
      "toolbar": "#2C2C2C",
      "toolbar_field": "#696969",
      "toolbar_field_text": "#F1F1F1"
    }
  }
}