Examine source code of Crunchyroll / ADN Remove Subtitles

{
  "manifest_version": 2,
  "name": "Sub Nuke",
  "version": "1.2",
  "description": "Toggleable subtitle blocker for Crunchyroll and Anime Digital Network.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "activeTab",
    "storage",
    "*://*.crunchyroll.com/*",
    "*://*.animationdigitalnetwork.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.crunchyroll.com/*"
      ],
      "js": [
        "content-cr.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "*://*.animationdigitalnetwork.com/*"
      ],
      "js": [
        "content-adn.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cr-subtitle-nuke@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}