Examine source code of SpeedFlix

{
  "manifest_version": 2,
  "name": "SpeedFlix",
  "version": "1.0",
  "description": "Playback speed control for Netflix. Use keyboard shortcuts or the popup to adjust speed.",
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon48.png",
      "96": "icon96.png"
    },
    "default_title": "SpeedFlix"
  },
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "*://*.netflix.com/*"
  ],
  "data_collection_permissions": {
    "required": [],
    "optional": []
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "speedflix@local",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}