Examine source code of video downloader

{
  "background": {
    "scripts": [
      "dlm/background.js",
      "./background.js"
    ]
  },
  "browser_action": {
    "default_popup": "./popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "assets/js/cocoparser.js"
      ],
      "matches": [
        "*://*.cococut.net/*hls.html*",
        "*://cococut.net/*hls.html*",
        "*://*.cococut.net/*hls.vhtml*"
      ],
      "run_at": "document_start"
    },
    {
      "all_frames": true,
      "js": [
        "myContent.js"
      ],
      "matches": [
        "*://*.cococut.net/*",
        "*://cococut.net/*"
      ],
      "run_at": "document_start"
    },
    {
      "all_frames": true,
      "js": [
        "assets/js/pagehelper.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.cococut.net/dlm/*dlm.html",
        "*://cococut.net/dlm/*dlm.html",
        "*://pro.cococut.net/dlm/*dlm.vhtml"
      ],
      "js": [
        "dlm/contentman.js"
      ]
    },
    {
      "matches": [
        "*://*.cococut.net/dlm/info/*",
        "*://cococut.net/dlm/info/*"
      ],
      "all_frames": true,
      "js": [
        "dlm/contentinfo.js"
      ]
    },
    {
      "matches": [
        "*://*.cococut.net/dlm/modify/*",
        "*://cococut.net/dlm/modify/*"
      ],
      "all_frames": true,
      "js": [
        "dlm/contentmodify.js"
      ]
    }
  ],
  "description": "__MSG_extDescription__",
  "icons": {
    "16": "assets/icons/16x16.png",
    "32": "assets/icons/32x32.png",
    "48": "assets/icons/48x48.png",
    "64": "assets/icons/64x64.png",
    "128": "assets/icons/128x128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "short_name": "CocoCut",
  "options_page": "./options.html",
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*",
    "downloads",
    "storage"
  ],
  "version": "2.54",
  "default_locale": "en",
  "commands": {
    "force-download": {
      "suggested_key": {
        "default": "Alt+Shift+D",
        "windows": "Alt+Shift+D",
        "mac": "Alt+Shift+D"
      },
      "description": "Send a 'force download' command"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{db329f96-f4db-4b6d-b270-2b84192d5308}"
    }
  }
}