Facebook video download

manifest.json

{
  "manifest_version": 2,
  "name": "Facebook video download",
  "version": "1.0",
  "description": "Download Facebook videos",
  "icons": {
    "48": "icons/fb-dl.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/fb-dl.png",
    "default_title": "Download Facebook video"
  },
  "background": {
    "scripts": [
      "index.js"
    ]
  }
}