Lightsoff

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Lightsoff",
  "description": "Turn all youtube into the dark but leaving the video you are watching, visible.",
  "version": "1.0.2",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "lightsoff.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "css": [
        "lightsoff.css"
      ],
      "matches": [
        "http://*.youtube.com/watch*",
        "https://*.youtube.com/watch*"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Toggle Lightsoff",
    "default_icon": "icon128.png"
  },
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}