Examine source code of Nextflix

{
  "manifest_version": 2,
  "name": "Nextflix",
  "version": "1.5",
  "description": "Adds a next-episode hotkey for Netflix",
  "homepage_url": "https://github.com/tmr232/nextflix",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1784828-f697-4bb0-a6fa-820a394b7da5}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "js": [
        "nextflix.js"
      ]
    }
  ]
}