Examine source code of Getify

{
  "manifest_version": 2,
  "name": "Getify",
  "version": "1.0.6resigned1",
  "description": "Getify brings the ability to get direct download link from hundreds of popular hosting websites with only one click.",
  "icons": {
    "48": "images/icon.png",
    "96": "images/icon@2x.png"
  },
  "author": "Alex Do",
  "background": {
    "scripts": [
      "js/getify.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "homepage_url": "http://projects.donh.name/getify",
  "options_ui": {
    "page": "index.html#/options",
    "open_in_tab": true
  },
  "page_action": {
    "default_icon": {
      "19": "images/icon.png",
      "38": "images/icon@2x.png"
    }
  },
  "permissions": [
    "contextMenus",
    "cookies",
    "downloads",
    "notifications",
    "tabs",
    "http://*.getlink.vn/*"
  ],
  "web_accessible_resources": [
    "css/*.*",
    "images/*.*",
    "js/*.*"
  ],
  "applications": {
    "gecko": {
      "id": "getify@donh.name",
      "strict_min_version": "42.0"
    }
  }
}