Hangouts mute shortcuts

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Hangouts mute shortcuts",
  "short_name": "Hangout keys",
  "description": "Mute/unmute yourself in hangouts from any application",
  "version": "1.0",
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://plus.google.com/hangouts/*"
      ],
      "run_at": "document_idle",
      "js": [
        "hangoutsvirus.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "shortcut_listener.js"
    ],
    "persistent": false
  },
  "commands": {
    "toggle": {
      "description": "Toggle mute",
      "global": true
    },
    "mute": {
      "description": "Mute",
      "global": true
    },
    "unmute": {
      "description": "Unmute",
      "global": true
    }
  }
}