Sound and video fixes for Facebook

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "1.0.1",
  "manifest_version": 2,
  "permissions": [
    "https://www.facebook.com/*",
    "storage"
  ],
  "icons": {
    "16": "icons/icon.16.png",
    "32": "icons/icon.32.png",
    "48": "icons/icon.48.png",
    "128": "icons/icon.128.png"
  },
  "commands": {
    "toggle-volume": {
      "suggested_key": {
        "default": "Alt+Shift+M",
        "mac": "Alt+Shift+M"
      },
      "description": "__MSG_toggleSound__",
      "global": false
    },
    "volume-up": {
      "suggested_key": {
        "default": "Alt+Shift+Up",
        "mac": "Alt+Shift+Up"
      },
      "description": "__MSG_volumeUp__",
      "global": false
    },
    "volume-down": {
      "suggested_key": {
        "default": "Alt+Shift+Down",
        "mac": "Alt+Shift+Down"
      },
      "description": "__MSG_volumeDown__",
      "global": false
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "js": [
        "content/content.js"
      ],
      "matches": [
        "https://www.facebook.com/*"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html"
  }
}