Examine source code of OLED by Slash Mark

{
  "manifest_version": 2,
  "name": "OLED by Slash Mark",
  "short_name": "OLED",
  "version": "1.0",
  "description": "A true OLED-black Firefox UI theme by Slash Mark. Pure blacks for maximum contrast and battery efficiency. Image-free design.",
  "author": "Slash Mark",
  "applications": {
    "gecko": {
      "id": "oled@slashmark.in"
    }
  },
  "homepage_url": "https://slashmark.in",
  "theme": {
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#e6e6e6",
      "toolbar": "#000000",
      "toolbar_text": "#ffffff",
      "toolbar_field": "#0d0d0d",
      "toolbar_field_text": "#ffffff",
      "popup": "#0d0d0d",
      "popup_text": "#ffffff",
      "popup_border": "#2a2a2a",
      "ntp_background": "#000000",
      "ntp_text": "#e6e6e6"
    }
  }
}