Examine source code of YouTube Blacklist

{
  "name": "YouTube Blacklist",
  "short_name": "youtube-blacklist",
  "description": "Blacklist channels on YouTube",
  "version": "1.2.17",
  "manifest_version": 2,
  "icons": {
    "512": "assets/youtube-blacklist-icon-512.png"
  },
  "browser_action": {
    "default_title": "YouTube Blacklist",
    "default_popup": "pages/popup.html",
    "default_icon": {
      "512": "assets/youtube-blacklist-icon-512.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "styles/content.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "web_accessible_resources": [
    "scripts/inject.js"
  ],
  "permissions": [
    "storage",
    "tabs",
    "*://*.youtube.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d4f976c-89d5-4711-9863-2edb7a97a09d}"
    }
  }
}