Examine source code of Browser Video Player

{
  "manifest_version": 2,
  "name": "Video Player Extension",
  "version": "1.2",
  "description": "A Firefox extension to load a folder and play video files.",
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "content_security_policy": "script-src 'self' blob:; object-src 'self';",
  "browser_action": {
    "default_area": "navbar",
    "default_icon": {
      "48": "icons/icon.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "video/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6251c8e-e1c2-4123-92ea-c2761f11afb3}"
    }
  }
}