Examine source code of Reddit video link

{
  "manifest_version": 2,
  "name": "Reddit video link",
  "version": "0.0.4",
  "content_scripts": [
    {
      "matches": [
        "https://*.reddit.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "https://*/",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "reddit-face-u.svg",
    "default_title": "Reddit video link"
  }
}