Examine source code of markdownQuantum

{
  "manifest_version": 2,
  "name": "markdownQuantum",
  "author": "Golga",
  "applications": {
    "gecko": {
      "id": "markdownQuantum@oyana.org",
      "strict_min_version": "57.0a1"
    }
  },
  "description": "Firefox Quantum render all markdown file/url with a dark theme.\n\r ",
  "homepage_url": "https://github.com/Oyana/markdownQuantum",
  "version": "0.2.3resigned1",
  "browser_action": {
    "default_icon": "img/ico/icon-128.png",
    "default_title": "markdownQuantumSettings"
  },
  "icons": {
    "16": "img/ico/icon-16.png",
    "32": "img/ico/icon-32.png",
    "48": "img/ico/icon-48.png",
    "64": "img/ico/icon-64.png",
    "96": "img/ico/icon-96.png",
    "128": "img/ico/icon-128.png"
  },
  "permissions": [
    "http://*/*.md",
    "https://*/*.md",
    "file://*/*.md",
    "activeTab",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "html/options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "all_frames": false,
      "js": [
        "js/_function.js",
        "js/_markdown.js",
        "js/scripts.js"
      ],
      "css": [
        "css/render.css"
      ],
      "matches": [
        "http://*/*.md",
        "https://*/*.md",
        "file://*/*.md"
      ],
      "run_at": "document_idle"
    }
  ]
}