Examine source code of Video Looper

{
  "manifest_version": 2,
  "name": "Video Loop",
  "version": "1.0",
  "description": "Set start and end times for a video loop",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icons8-loop-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "andreiflausino@live.com",
      "strict_min_version": "50.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}