Examine source code of Universal Custom Player

{
  "manifest_version": 2,
  "name": "Universal Custom Player",
  "version": "1.1b",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "http://mirgosoft.com/addons/universal-custom-player/",
  "author": "Vladymyr Myrhorodskyi",
  "icons": {
    "96": "icons/main_icon-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "scripts_content/message_listener.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "shared/scripts/options.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "webNavigation",
    "storage",
    "downloads",
    "*://*/*"
  ],
  "browser_action": {
    "default_icon": "icons/button_icon_2-96.png",
    "default_title": "Universal Custom Player",
    "default_popup": "popup/popup_menu.html"
  },
  "web_accessible_resources": [
    "shared/img/icon_adv_actions.png",
    "shared/img/icon_download.png",
    "shared/img/icon_button_highlighted.png",
    "shared/img/logo_white.png",
    "shared/img/logo_blue.png",
    "shared/img/player/full_screen_button.png",
    "shared/img/player/play_pause_icon_little.png",
    "shared/img/player/play_pause_indicator_large.png",
    "shared/img/player/resize_and_full_window_and_refresh_buttons.png",
    "shared/scripts/options.html",
    "shared/scripts/support_us.html",
    "shared/scripts/help.html",
    "shared/scripts/contacts.html",
    "shared/scripts/license.html",
    "shared/scripts/download.html"
  ],
  "applications": {
    "gecko": {
      "id": "contact@mirgosoft.com",
      "strict_min_version": "50.0"
    }
  },
  "default_locale": "en"
}