Examine source code of Plex skipper

{
  "manifest_version": 2,
  "name": "Plex skipper",
  "description": "__MSG_extDescription__",
  "version": "2.4.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "64": "icon/64.png",
    "128": "icon/128.png",
    "256": "icon/256.png"
  },
  "permissions": [
    "storage"
  ],
  "default_locale": "en",
  "browser_action": {
    "default_title": "Plex skipper",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/web/*",
        "*://app.plex.tv/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{66286e6b-084c-4c2b-b2a5-188cc8d5a58b}"
    }
  }
}