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manifest.json
{
  "name": "Theater Mode (for YouTube)",
  "description": "Yet another theater mode!",
  "author": "Daniel Renitsa - Andrew Da Geek",
  "version": "1.1",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "cookies",
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "FirefoxYoutubeWideScreen.js"
    ]
  },
  "icons": {
    "45": "icons/default.png"
  },
  "browser_action": {
    "default_icon": "icons/default.png"
  }
}