Examine source code of Deep OLED Blackout

{
  "manifest_version": 2,
  "name": "Deep OLED Blackout",
  "version": "2.0.0",
  "description": "A true black Firefox theme optimized for OLED screens. Ultra-minimal, battery-friendly, and easy on the eyes.",
  "author": "Subhashankar Behera",
  "theme": {
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#FFFFFF",
      "tab_text": "#FFFFFF",
      "tab_selected": "#000000",
      "tab_line": "#FFFFFF",
      "toolbar": "#000000",
      "toolbar_text": "#FFFFFF",
      "toolbar_field": "#000000",
      "toolbar_field_text": "#FFFFFF",
      "toolbar_field_border": "#333333",
      "toolbar_field_focus": "#000000",
      "toolbar_field_text_focus": "#FFFFFF",
      "popup": "#000000",
      "popup_text": "#FFFFFF",
      "sidebar": "#000000",
      "sidebar_text": "#FFFFFF",
      "icons": "#FFFFFF",
      "ntp_background": "#000000",
      "ntp_text": "#FFFFFF",
      "ntp_card_background": "#000000"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "deep-oled-blackout@subhashankar.dev"
    }
  }
}