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manifest.json

{
  "manifest_version": 2,
  "name": "Enhancer for YouTube",
  "version": "1.0.0",
  "description": "Adds useful enhancements to YouTube: mouse-wheel volume, speed presets, theater mode, auto-HD, screenshot, PiP, loop, and keyboard shortcuts.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Enhancer for YouTube",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "commands": {
    "toggle-theater": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Toggle theater mode"
    },
    "speed-up": {
      "suggested_key": {
        "default": "Alt+Shift+Period"
      },
      "description": "Increase playback speed"
    },
    "speed-down": {
      "suggested_key": {
        "default": "Alt+Shift+Comma"
      },
      "description": "Decrease playback speed"
    }
  },
  "applications": {
    "gecko": {
      "id": "enhancer-for-youtube@example.com"
    }
  }
}